Car and Driver shares their comparison pitting the F10 M5 versus the F13 M6 at the Anglesey Circuit in the UK to see if the M6 is truly better at the track than the M5, as advertised.
The M5 and M6 share the same 560hp powertrain, but the M6 is billed as being even more suited for the track with its lighter weight (about 100 pounds), lower center of gravity (due to lighter carbon roof and lower roofline) and slighter faster acceleration (about a tenth of second faster to 0-60, at 4.1 seconds).
Check out the real world results and differences on the track.