I am unfamiliar with the Audi entirely. I based my conclusions on the experience I described, they could be outdated, but top weight seems to me like an inherent physics problem. If you put the same tech the Audi SUV has in an Audi SEDAN, which would be faster? In the case of the BMWs, I favored the sedan, by a lot.
And I suspect the CT5 Blackwing will do pretty well on the 'Ring.