Originally Posted by Just_me

Corvette is a slow car, much slower than expected. It seems like the germans are better to get the power to the ground or GM are way to optimistic with their times.

Here is some results from European carmag

C6 (not the convertible) / SLK55 / M3
0-100km/h 5.2 / 4.8 s / 4.8 s
0-200km/h 16,8 s / 16,8 s / 16,8 s

Source: Sportauto.

Im certain that Z4 M will be faster than C6 as well.

Just wait for the carmags to drive the cars and then let's see who is wrong or right. Now its pure speculations...