I was surprised that the XKR was not that much more expensive than an M3 when new. Considering the XKR has active dampers, heated and cooled seats and front parking sensors as standard; the M3 had none of those. I find it to be much more refined, the interior is much nicer and there are more features like heated front windshield and heated steering wheel. Being supercharged the V8 AJ-V8 GEN III R engine produces quite a bit more power than the M3 at 510hp, and as such I have found it much quicker than the M3. The gearbox is a normal autobox, but the shift times are pretty much the same as the DCT, and being a normal autobox normal driving is much smoother. Not sure if the two cars are in the same class as such but unfortunately I am finding the XKR a far superior car.