Braineack said:
shoot the 7Dm2 on a crummy lighting day that requires higher ISOs and report back.
I dunno...the Nikon 300/2.8 is a high quality lens, and can take a converter (or maybe even the 1.7x for a 510mm equiv) to get a nice 420mm f/4 focal length. I think right now is maybe not quite the right time to make a move, but it depends on how you are about buying then selling off gear. My feeling is that YES, the 7D-II has the great AF system, and the fast firing rate, but honestly, I looked at some evening bird stuff shot by a guy in Southern California, along the beaches...ehhh...low noise, reasonably so, but not much detail. I just have the feeling that the 7D-II is almost exactly what the Nikon D2x was for me: a fantastic body and sub-systems, with an inferior sensor that's going to very soon, be made obsolete by something better from "the other guys".
I think mid- to later 2015 might be a big year for new cameras. Canon has two (three?) new models coming out. Sony has NEW 24 and 36 MP full-frame sensors this spring. I think we're close to a round of new offerings...might not be quite the right time to make a move just now. Or....buy a 7D-II and use it over the summer or for however long.