IMHO this is a pointless comparison. If you want to compare something to the C6 compare a Lotus Elise S/C. The only thing the C6 will do better is comfort (by a landslide too).
I think alot of us on this board could have purchased a C6 if we wanted. Its a wonderful car, but I prefer my BMW.
If I am doing 95% track 5% street I would go with the C6, but im not