- IQ of the 5DII is noticeably better.
When making large prints from ISO 1600 and higher shots...yes. Otherwise I have yet to find a person who can tell me print from print when the prints (16x24") aren't labeled. And that's the real test because otherwise biases, both conscious and subconscious, overwhelm reason.
Granted I apply a bit more processing to 7D files then 5D2 files. A little more sharpening and local contrast enhancement, and sometimes a little more NR.
- ISO noise is over a stop lower - if you shoot indoor portraits in ambient light, that's a big help.
Agreed. With that said, the 7D can reliably go to 3200 for medium sized prints (11x14). I often find nailing focus with fast primes in low light to be the bigger challenge, and the 7D is noticeably better here.
- The larger pixels of the 5DII mean you can stop down further before diffraction begins costing you sharpness in your landscape shots.
False. Diffraction does not impact any format more than any other for a given combination of FoV and DoF.
- DoF is thinner on FF, which is useful for portraits (for the same framing, for the DoF you get at f/2.8 on FF, you'd need an f/1.8 lens on APS-C).
True. But there are caveats:
1) Thin DoF comes into play for head shots. FF is really thin here shooting primes wide open, thinner then most people care for. I'm surprised how often this is cited as an advantage given how rarely I see portraits with super thin (one eye in focus) DoF.
2) If you need more DoF then you get wide open on FF, then you all of a sudden lose the high ISO advantage vs. crop. If you can shoot FF wide open, then focus becomes even more critical.
This is considering fast primes. If we're talking f/2.8 zooms, then FF tends to be in a sweet spot wide open. I can understand why, for example, a wedding photographer with f/2.8 zooms would want FF DoF.
If you're shooting in good light, you can post-process the 7D images to essentially the same quality as the 5DII (except for the DoF part, since despite the new background blur tools in CS6, you can't get the same look). But it takes a fair bit of work, and the 5DII gets it right straight out of the camera.
The work is no different. It's just different numbers in the same dialog boxes, or different settings in the camera styles.
I've owned a 7D since April/May. It's a great camera, you won't be disappointed. The one huge difference that I noticed right away is the ISO noise. The 5DM2 blows away the 7D in this area. If noise is a big concern, you should really rent both cameras and look for yourself. I really believe that anything past ISO 400 on the 7D has too much noise.
If noise >400 is too much on your 7D, then there's something wrong with your 7D. One of my favorite candid shots of a relative's baby was shot at ISO 800, pushed 1/3rd stop in ACR, and printed to 20". There is no noise.