No problem, here you go:
RS4
It is the second time I drove this car. The first time, I really was overwhelmed how the car pulls. The second time not so much anymore, I don't know why (I did not have the Polestar then). It is just totally different than the Polestar. Its a V8 without a turbo. For everyday driving I think the Polestar is the better choice. The engine of the RS4 is more something for track use. It revs really high and pinches you in the seat. But its very nervous, it reacts immediately. Just telling from my personal feeling; I do not think, the RS4 pulls stronger than the Polestar (probably because it has less torque than the Polestar). It just pulls different, no delay, nervous, but it doesn't run out of breath.
The dual clutch is very nice. Instant shifting, faster than the Polestars slushbox. But I knew that one already. But what I really don't like is, that it also shifts automatically at the rev limiter, even when you are in manual. The Polestar doesn't do this, which I think is great. Another thing, that is different, is what happens the second after you shifted. The RS4 pulls seamlessly. The Polestar on the other hand, its like the shifts are "harder", its like the car pulls harder after each shift. Its hard for me to explain in english, I hope you get what I mean...
Overall, the dual clutch is better, but with one big minus, that it shifts at the rev limiter even though you are in manual.
Suspension in the RS4 is nice. But I think it does not turn in as nice as the Polestar. You can change the characterisic by a touch of a button. Of course this is cool, but somehow I like the mechanical version of the Polestar as well (even though I haven't change anything so far). The overall balance of the car is similar to the Polestar. It is more or less neutral and starts do understeer once you cross the limits. Very easy to drive. Almost no body roll, like the Polestar.
The Sound... Ok this is really nice. Especially the rev matching sound that it makes. While I think the sound of the Polestar in sportmode is from another world when accelerating hard or when you just cruise around in sport mode, the RS4 takes this to another level, but just when shifting back. Overall, I really like the sound of the Polestar better. It sounds meaner. Then again, this car did not have the sport exhaust option. Maybe I would change my opinion if it had the sport exhaust.
Interior is nice. Quality is definitely better than in the Polestar. Audi's just the benchmark in this category I think. They care about every little detail. But the Polestar does well. I do like the swedish interior. But the materials in the Audi are just a bit nicer. But I like the Polestar seats better. They are more comfy with the benefit of better lateral support than the Audi seats.
The RS4 looks really really good. It looks like it is made out of one piece. I really like that car. And it IS faster than the Polestar (even though it does not feel so). Nevertheless, I don't think it is worth CHF 40000.- more than the Polestar.