I have owned nothing but Audi since 1993, but it has to be said that the automotive press all appear to be very impressed with the new M5 (as unattractive as it is).
The new RS6 will win the looks battle without much effort, I just hope that the performance puts it in a league of it's own. I've already seen enough posts of the RS5 being walked by the existing M3. I am hopeful this will not be the case with the new RS6.
I remain hopeful.