I am going to address the weight issue head on because I don't think people understand it.
The weight has increased, but the grip and lateral traction has been increased commensurately. The car can corner very well as an M Car should. It isn't a straight line car like the E63, CLS63 or S6. The M5 loves corners.
2014 ///M5 Individual Frozen Grey, Silverstone Full Merino, Piano Black, Exec Pkg, Drivers assistance plus, LED Pkg, Bang and Olufsen, 343M