My friend crashed his 745i and his insurance gave him a healthy allowance with which to rent a car. He got a C63. Suffice it to say, if there wasn't great traction contol on that thing, I probably would not be writing this post. That thing can hit 100mph between stop lights... luckily he couldn't figure out how to turn of the traction contol. It accelerated to 120 like my car hits 80. It sounded insane too. Great brakes as well... thank God.
On the downside, I think that my two door bimmer has more legroom in the back seat.