The new M5 is TOO BIG. I drove an F10 and it's just like a barge. That's the real problem. Why do they invest so much R&D in making a whale handle well is beyond me. I now realize that Mercedes is clever when they don't really care if their big saloons handle well. They only add power and brakes.
560hp is not extraordinary. It's clear that BMW also had efficiency in mind besides the power.
The new M3, on the other hand...