Coolfrank, all 2011 and newer 5 series are F10s.
I agree with you. I used to have a 2009 GS460 with Mark Levinson and I found the mid range clarity and the lows to be much better despite fewer watts.
FOR SALE: 2013 ///M5 Individual Click for pics and info
Monte Carlo Blue, Platinum Full Individual Merino, Platinum Alcantara, Piano Black, Exec Pkg, Drivers assistance pkg, Bang and Olufsen, 20" wheels