I drove a b8 s4 a few weeks back and a CPO e92 a few days earlier. As others have said, the s4 felt like a bigger vw. I honestly felt that the s4 was no quicker than my current vehicle (04 vw r32). With that said I loved the interior of the s4. When I test drove the e92 m3 it was the whole package that drew me to the m3 over the s4. The M is just in another ballpark. The s65 sounds sooo good, it handled great and looks menacing. Not to mention, the DCT was better than I anticipated. Overall the M3 makes me go from 6 to midnight.