I hate the M6 seats. Lol! The headrest is no where near as pillowy as the M5's. The side bolsters do nothing for me on the M6, but the new 2014 seats with their side bolsters make a big difference. There's also more shoulder bolster support for the M5 seats. I wish the U.S. market got the M6 seats on UK and German spec M6's. Old topic, but I thought I'd chime in.
. Also I still hate the M6 seats.
