There have been much talk on this board how the M3 Coupé have an advantage over the competition for being a Coupé, particulary on a track.

In latest issue of Sportauto they tested the 4-door M3 on Hockenheim + acceleration times. 4-door M3 had the exact same tires as M3 Coupé.

So here is the result:

E90 vs E92

0-100km/h: 4,9 / 4.8 sec
0-200km/h: 15,9 / 15,7 sec

Hockenheim: 1:14,6 / 1:14,3 min
Slalom 18m: 68,6 / 69,2 km/h

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Yes, it's true the Coupé performs better but the difference is extremly small. Not as big as some might have think.
Credits were due, the 4-door M3 is just as great car as M3 Coupé. Beauty vs practicality, your choice.