I've gotten keepers at ISO 5000 with my EOS-M but it has worse AF than the 6D I personally love toying with compact mirror less. I also have Pentax Q, but even my 1D3 takes better pics than both of the mirrorless. I would put the EOS-M and 7D in the same category of IQ and noise performance, but the 7D is a much better body to use