The stock clutch on new M3 is too light & has a non-linear feel. That is caused by (evil) clutch pedal spring. When I shift very fast I notice that the clutch is a little slow to come back up, and does not come back up as fast as my foot does, that is the reason why we 6 speed people feeling notch and cannot shift fast or smoothly.
If you are thinking about removing the helper spring on the clutch pedal please click here for details.
http://www.m3post.com/forums/showthread.php?t=195777
You can always put it back on in case if you don't like it. I did on mine and made big difference on every gear shifts.
I do not understand why BMW put this (evil) device but this clutch pedal spring is terrible idea for either non experienced or experienced manual drivers.
just my 2 cents
Happy Motoring.