Originally Posted by Roki_014
I think the fair comparison would be s4 vs M3 Sedan and not 335i vs S4
No, the 335i vs S4 makes more sense. They have similar performance and price. An M3 has almost 100 more horsepower than an S4 and a starting price of about 13k more.
The RS4 is what's supposed to compete with the M3, although I'm not sure Audi is offering that in the U.S. right now.