Purchased a highly optioned Q8 (air suspension, 4wheel steering, full leather, 5K B&O stereo, all S-line packages). Was comparing against a Cayenne S of the same model year. The Cayenne S was not quite as nicely specced as the Q8, but obviously has the more powerful motor than the standard Q8. Porsche does their full leather interiors a bit nicer and covers some areas Audi does not, like the lower door panels. The Q8 was significantly quieter inside, but the Cayenne did not have the noise insulated glass option (which made a difference on my prior generation Cayenne). The Q8 did not feel nearly as engaging as the Cayenne, but I felt this made it more stately. Not quite as removed as a Range Rover. The Q8 is a rare bird on the road in my area of the country - more Cayennes and definitely GLSs or X7s. In fact, since I bought mine, I have not seen another Q8 on the road, which gives it a little more of an exclusive feel, if that is important to you. I gave it a 4 for the interior design, because I still like to have physical buttons for the climate control. That may not be important to you. In addition, the rear seats need to be put down manually and on a vehicle around 100K, that would be something I would expect. Otherwise, the interior is excellent from build quality to tech features and ease of use. With the S-line package, there are huge 22" wheel/tire. Surprisingly good ride even in the dynamic mode (note: air suspension was optioned). Overall, very pleased with the Q8.

They have some bugs to work out with the infotainment tech, but the car is spectacular in every other way!!! And out dealer was SPOT ON!