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Depending on the variant the max power output is at 7000-7500rpm on the Mclaren engine. I've found a few dyno's online that suggest it builds torque steadily to about 4500rpm, then power is around 515hp at the wheels from 6500rpm to 7700rpm or so. Most S63Tu dynos show about 2500rpm to 5000rpm which will make a massive difference to the feel of the car.
I don't quite get the point of having the M6 the size it is for the reason you said (especially as the M4 exists), the back seat isn't really useful! Either make it smaller and lighter and more extreme, or a bit bigger, maybe the same wheelbase as the M6 GC, and maybe the GC could be on the 5 series long wheel base platform for China?
If you made them both a bit bigger that opens up BMW to make a 2 seat or 2+2 Z5 or Z6 available in coupe and convertible just like the Z3M and Z4M. This would be the car that gets the transaxle and ends up with more weight over the rear.
The AMG GT did an amazing lap time on Top Gear of 1:17.5 which is right up there with genuine super and hyper cars - faster than a GT-R and a Veyron! During the current series they said the new M3/M4 was 4 seconds quicker than the old one but didn't actually show it or reveal the exact time, but that would put it at about 1:21, which isn't bad but still a long way off the AMG GT.
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