As long as the lens is up to it. I've experimented with my old 24 2.8 on both my 6D & EOS M. It looks lovely on the 6D, a bit ugly on the M as soon as you zoom/crop a bit. I guess that's why Canon has updated a few of the L's lately, ready for the 5Ds.
Exif -throw a great lens on both, no difference.










