I looked at the audi S4, It def felt a bit faster than the 335 but they are both par. I don't like the interior of the audi and i loved the new f30 style compare to the ongoing model of the S4 which should be due for a model change soon. the biggest factor is i don't like the Audi brand for some reason, not one bit. I would buy a honda rather than a audi...
If A6 didn't have an audi badge on it, i would buy it any day