I'm going to side with racerx on that one. It's one of the best-looking sedans ever. The only thing I'd change is the shape of the head lights.
To be honest, it's definitely a form-over-function design. There's a reason MB is marketing it as a "4-door coupé".
On the other hand, I think everyone will agree that the A7 abomination picture above is fugly. Hint to VAG: enough with the stupid oversized front grilles!