To me putting on a M5 badge is 10000x worse than a car with M5 parts on it without the badge.
Would i go and make my F10 look identical to a M5? no i wouldn't but would i slap on some M5 parts like the trunk lip or diffuser? sure because it looks awesome and it enhances my car.
Theres a kid by me with a white E60 528 that tries so hard to be a M5 but failed dramatically. He has the M5 badges on it and all. Now it looks like he has a F10 535 msport so lets hope he doesn't slap some M5 badges on that too. I would seriously leave him a note if he did because he would make us normal f10er's look bad.
Current - 2013 N55 535xi Msport SAT
Retired - 2009 N54 335i Msport 6MT
Retired - 2000 M52TU 323i ASA Supercharged 5MT
More Photos of my car here