It looks like a very decent upgrade from every perspective, but in the end the only way to really evaluate this camera isn't by its specs but by its operation and execution. I'll be at Melville, NY on Monday with some of my favorite lenses (35Lmk2, 85mk2, 100Lmacro, 70-200 f2.8Lmk2), a pair of 600exrts, a tripod and my 5D3 so I can take some side-by-side shots and check out things like AF performance, low-iso noise, buffer, the touch screen, low-light AF captures, et cetera. I hope I can give it a workout. I'm looking forward to feeling its weight difference (it's a little lighter).
Of course it will be better than the 5D3. How much better in use and IQ, I wonder? The 5D3 price will fall now so the Big Q for me is about which Price
erformance ratio is going to be more compelling. I have a pair of 5D3s, but this might be an ideal time to pick up another and keep enjoying this camera for another couple of years. The 5D4 isn't going to get me more work, but if I feel like my hit rate will be better or if the IQ really stands out to me, I may jump on this new thang.