I drove the C7 A6 a couple of weeks ago. I really like the power train. Also like the tech a lot too. And the price. Those who care about throttle response will love the A6 - it's instantaneous.
But I also was reminded I don't like the looks, the interior does feel a little cheap by my standards, and would have preferred the active suspension of the European models. I test drove both the sport and the non-sport package and thought I would like both of those setups for different occasions.
FOR SALE: 2013 ///M5 Individual Click for pics and info
Monte Carlo Blue, Platinum Full Individual Merino, Platinum Alcantara, Piano Black, Exec Pkg, Drivers assistance pkg, Bang and Olufsen, 20" wheels