If you read the C&D article, their comments about the M5 and M6 are just depressing. Although they seem convinced BMW can fix the issues? (mostly brakes and steering from what I remember).
Originally Posted by Eric335
The ZL1 did a damn good job...
I had one go past me on the track like I was standing still. I feel a better seeing these results
Originally Posted by AndreyATC
S6 is not M5's competitor
It is something between 550 and M5
I'm driving one right now (my X6M drowned in the storm) and it's a hell of a car
S6 is now light, nimble, well ballanced and has a one crazy powertrain for its size
They say their target competitor is the 550xi. I think for the little extra money, I'd probably go with the S6 - the reviews (including yours) are amazing.