The F10 M5 does use an electronic parking brake, as mentioned, and therefore does not have a "big brake" but rather uses small little calipers like our own, just painted to match. Even the multi-thousand ceramic option comes with less then desirable rears.
nuebbes - Those look like the M3/M5 brakes... been wondering recently if the F80/82 M3/4 ceramic brake calipers will be PnP for us. The base M3/4 uses the F30 M Performance brakes which has been shown multiple times on this thread to be PnP. This leads me to believe the F80 ceramic calipers (looks like the gold ones posted above) may be PnP, and without having to spend $8,000 just put in cast iron rotors instead of ceramic. Thoughts?