Just read Car&Driver comparing the M3, C63, and the Audi RS4. As expected the M3 is the best all around performer but the Mercedes knocked of a 3.9 sec run to 60mph
. That's impressive for a 4,000 pound car. That's faster than the Carrera S and even the GT3. Too bad they didn't make it 500 pounds lighter.
Here is the link:
http://www.caranddriver.com/comparisons/14276/08-mercedes-benz-c63-amg-v-07-audi-rs-4-v-08-bmw-m3.html