[TopDown]

I get to drive my wife's 335i on the weekends, so I compare it against my M Roadster, which I drive during the week.

The 335i is quicker (acceleration) than the M at lower RPMs. When it comes to accelerating at any RPM, in any gear, the 335i's 2-turbo is one of the best production engines I've driven in that regard.

At higher RPMS (>4500) the M becomes more serious fun than the 335i. Run the M up to 7000+ RPM in 3rd gear and listen to a mechanical symphony. Keep the M in 4th gear at freeway speeds up an 8 percent grade and you can pass anyone with ease. From 5500 - 7900 RPM the M's sound and fury make the hairs on my neck stand up.

And as far as stopping, the M's brakes outperform the 335i's - I understand they're borrowed from the outgoing M3 CSL.