One thing that kills it for me, is just the styling of the E63's. Can't get past both the looks on the outside and on the inside. However, I still think the front end design on the 2012 CLS63 is one of the best I've ever seen, but they totally negated it with the ugly rear end on that car.
I just can't wait to race a new 2014 E63 and see the results, rolling race only though, like Vic said.