From Insideline's X6M test
As tested Curb Weight (lb): 5,256
Test Results:
0 - 30 (sec): 1.7
0 - 45 (sec): 2.9
0 - 60 (sec): 4.3
0 - 75 (sec): 6.4
1/4 Mile (sec @ mph): 12.6
0-60 with 1 foot of rollout (sec): 4.1
From the 0-60 time I can't see how the lighter ///M5 won't beat this by some margin.
It looks beautiful and I love the M6-like wheels with a modern touch. Like what they've done with the engine aesthetics. Not overdone, just evil looking