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The designers of the Q8 could easily have been tempted down the route travelled by the BMW X6 and Mercedes-Benz GLE Coupe, in making the Q8 a coupe-like SUV with a heavily sloping roofline. But although there’s quite a bit more slope than on Audi’s other large SUV, the Q7, it’s not as severely sloped as the rivals mentioned, giving the Q8 its own character. The Q8 is also shorter and wider than the Q7 in order to help towards the visual aggression, and the massive front grille and flared wheel arches helped on that score as well. Some of the bodywork elements vary in colour depending on the equipment level, with S line models featuring 21-inch alloy wheels and a bespoke styling pack, while the range-topping Vorsprung versions gain 22-inch wheels and predominately black detailing.

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Being the top-tier SUV in Audi’s range, the interior of the Q8 draws from the same high-tech elements that feature in both the A8 and A7. The result is a dashboard that is almost devoid of physical buttons, instead utilising digital touch-screens where possible. The high-gloss black dashboard features a 10.1-inch screen at its centre, below which lies a secondary 8.6-inch display for adjusting climate and seat settings. When turned off, these screens partially blend into that black dashboard surface, complementing what is already a very clean design. Using all this stuff does take some getting used to, but considering the amount of functionality it controls, and how complex these functions are, it’s a fairly intuitive system to use. Now a familiar sight in most Audis, the instrument cluster is a 12.3-inch configurable display, and there’s a sizeable head-up display also available. Importantly, the cabin also features materials that are of incredibly high quality that make the car feel incredibly posh and maintain Audi’s reputation for delivering some of the very best interiors in the business.

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It may be the sporty SUV of the line-up, but the Audi Q8 isn’t short of practicality. Unlike the Q7, the Q8 is only a five-seater, but the car’s long wheelbase results in good rear passenger legroom, even for whoever has to sit in the middle seat. The glovebox is notably massive, too.

The boot can carry a generous 605 litres of luggage, which can swell to 1,755 litres when the rear seatbacks are folded down. Those seatbacks don't quite sit perfectly flat, but there's only a gentle slope to negotiate. The boot also has an electrically operated tailgate, while the wide opening and low load lip also help make it easy to load. For those that tow, the Q8 will be available with a useful Trailer Assist function. This takes all the hassle out of reversing when hitched up to a trailer, and it’s quick and easy to operate via the dashboard’s dual-screen setup.

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The Q8 comes with standard air suspension that varies its stiffness and its ride height, according to which of the various driving modes you select. Even when set to the most forgiving ‘Comfort’ mode, the ride still has a slightly firm edge, so it doesn’t feel as wafty as you might expect. However, it’s still compliant enough to keep you comfortable on most surfaces, and at most speeds. Select the sportiest mode, though, and things get quite a lot harsher, and we think it might be too harsh for some buyers. Yes, this mode does make the handling a wee bit sharper thanks to marginally better suppression of body roll, but even in Comfort mode, the Q8 feels impressively sharp for a big, heavy SUV, so you’re best off just sticking in that mode.

There’s also an all-wheel-steering system that’s optional on S line cars and standard on Vorsprung models, and this helps agility further - as well as making for more stable high-speed lane-changes - by turning the rear wheels in the same direction as the fronts. However, the benefit of the system is more noticeable at low speeds, where the front and rear wheels are turned in different directions to improve low-speed manoeuvrability and tighten up the turning circle.

As the car’s styling suggests, four-wheel drive is standard-fit, and the car’s off-roading credentials are further helped by short overhangs and suspension that can raise the car’s ride height, and as a result, improve ground clearance. Don’t go thinking that the Q8 is some accomplished mud-plugger, though, as it’ll only ever be suitable for very minor off-road work.

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At launch, only one engine is offered, a 286 horsepower 3.0-litre turbocharged V6 diesel engine. It comes as standard with an eight-speed automatic gearbox and Audi’s quattro all-wheel-drive system. The Q8’s generous torque ensures strong, muscular performance from low revs that keeps life easy, and more meaningful pressure on the accelerator pedal results in very impressive acceleration indeed. All that torque helps in the towing department, too. However, it’s the Q8’s gearbox that hampers how responsive the car feels. Ask for a sudden burst of acceleration, and the gearbox takes a second or so to figure out what it wants to do, and then another second or so to actually do it. The combined delay results in a curious feeling of, well, nothing happening, followed by an enormous burst of all-at-once thrust. It’s a shame, because otherwise, the gearbox slips through changes with the kind of smoothness you would expect from a luxury car. Aiding fuel consumption is a mild hybrid system that uses a 48-volt battery in the rear of the vehicle. When the Q8 is coasting at speeds between 34 and 99mph, this enables the combustion engine to shut off for periods of up to 40 seconds while the battery powers the onboard systems. The engine then restarts seamlessly once you press the accelerator.

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You wouldn’t expect a big flagship SUV – especially an Audi one – to be a cheap car, and it really isn’t, but importantly, the Q8’s price is competitive with those of its main rivals. If you’re talking about the basic S line version, that is. The range-topping Vorsprung model adds almost 20 grand to the price, which makes it considerably pricier than most rivals, but the Vorsprung model does add pretty much every optional extra it’s possible to add to the S line.

Audi has the edge on most rivals when it comes to official fuel economy and CO2 emissions figures, though, which will have much to do with that 48-volt hybrid system. This system is unlikely to have any major impact on servicing costs, either, but from a wear-and-tear perspective, the fact that the smallest wheel size is 21 inches in diameter means tyre replacements will be costly. It’s also worth investigating Audi’s servicing packages to cover other consumables.

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Audi’s position in the manufacturer rankings of Warranty Direct’s Reliability Index is low, although the study has no data on the Q8 or the latest Q7 with which it shares most of its mechanicals. It's a similar story from JD Power's annual Vehicle Dependability Study, which had Audi near the bottom of its rankings in both 2017 and 2018.

Many of the Q8’s advanced driver assistance systems already feature in other models in the range, which is reassuring from a reliability point of view as they've been tried and tested. While past performance from Audi as a whole doesn't inspire confidence, we'll have to wait and see how the Q8 performs before we condemn it.

As with its other models, Audi provides a three-year standard warranty up to 60,000 miles. Owners have the option to add a fourth year of warranty cover up to a total of 75,000 miles at an additional cost that varies according to model. The same process applies to adding cover for a fifth year or up to 90,000 miles.

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The Q8 hasn’t yet been tested by road safety organisation Euro NCAP, but Audi’s products usually achieve a five-star rating when they are. All versions of the Q8 come with six airbags and LED matrix headlamps that can bend their full beams around oncoming cars so as not to dazzle other motorists, along with driver assistance systems including automatic emergency braking and lane departure warning. If you’re prepared to raid the options list, the Q8 can be specified with 39 separate driver assistance systems, but many of them come as standard with the Vorsprung model. These include - among many others - a 360-degree camera, camera-based traffic sign recognition and a more sophisticated cruise control system that basically amounts to semi-autonomous driving.

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Affirming the Q8’s performance bent, the range kicks off with the sporty S line version. This comes with a self-parking system, a reversing camera, cruise control, two-zone climate control and electrically adjustable and heated front sports seats finished in a mix of leather and made-made suede. Sitting above the S line is the Vorsprung model that carries a sizeable price jump, but does add a lot more equipment, including a panoramic glass sunroof, full leather upholstery, heating for the outer rear seats, four-zone climate control, extended LED ambient lighting, head-up display, soft-close doors and an upgraded Bang & Olufsen stereo.

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The Audi Q8 is for those that want something that does a similar job to the BMW X6 or Range Rover Sport, but that is markedly different in looks. It comes with a very impressive interior that’s laden with the latest in connected services, in-car technology and driver assistance systems, and the build quality alone goes some way towards justifying the hefty price. If you don’t need a third row of seats, this makes for a more interesting alternative to the seven-seat Audi Q7.