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.
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