It looks like from Steve Gandy's site one could with a couple of adapters get a Canon FD lens on an M8.
And why you might ask?
Well the fast wides in FD are a couple of hundred bucks used and even the 14mm 2.8 FD is less than a grand.
Any one ever tried an FD on an M body? Or should I go back to my left over new year's champagne and forget this madness?