I wouldn't take these lap times too seriously as they were done in different days and by different drivers. The 335i coupe lap time listed is also 3.2 seconds faster than the 135i, 1.2 seconds faster than a Z4 M and only .1 seconds slower than a Z4is. That doesn't sound normal to me.
I bet the F30 and E90 handle pretty similarly and would show very similar lap times all else being equal.
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