So playing devils advocate for a moment, what do those for whom this is a "big deal" need from a MkIII that the MkII doesn't give you? I'm not talking about inevitable evolution, a few more MP and a a couple of fps increase, they are both almost certainly modest bumps that aren't going to make a huge difference. Even moving to the modern sensors would only give you benefits below 400iso and I'd expect few 7D series users are shooting their sports and wildlife below 400 iso most of the time as you just can't get the shutter speeds. What's the "big deal"?
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