Phil, I have driven the CLK Black, (that was me in our launch video driving past the camera car with the LP640 on the other side). The CLK Black is a very playful car and I'd describe it a little like my M3 CSL in being quite a playful and deliberately irreverant car to drive.

From what I understand of the Gran Turismo S, it's a more grown up kind of car, but as you probably spotted from the embedded videos, it's very loud and would probably retain some of that 'irreverance' you are familiar with in the CLK Black.

The only question I cannot answer is how much you would notice the drop in performance, although based purely on the power/weight figures I suspect it would be quite a bit slower. I will ask Richard, who has driven them both and see what he thinks.