Check out this video I found from M3 Forum:
http://media.putfile.com/m3-vs-335i
Apparently, according to the M3 owner: It's a drivers race, plain and simple, no butt's, no iff's. Everything was pretty much even, passenger weight in M3 was 430lbs, passenger weight in 335i was 415lbs, both had 3/4 tank gas remaining. In the first video, the M3 jumps and pulls and keeps the lead all the way to about 110...in the second video, the 335i kinda has momentum starting, so it's tie all the way until the 2-3 mis-shift by the 335i driver. Given equal drivers, equal conditions, these cars are even..hence the identical 1/4 e.t. and trap.
The 335i is quite impressive!!