Sorry to beat a dead horse...

I had a 6D. Excellent camera, great IQ, small size (for a FF camera), best high ISO performance of any camera I've used thus far.

Ultimately, however, I gave it up for a second 5D3 once the price on the latter came down enough. Why? Mainly AF performance. Although the 6D worked well for still subjects and landscapes, once I started shooting more events, its shortcomings became more apparent. The outer points just aren't that dependable in less than bright light. OTOH, I've found that the 5D3's AF rarely lets me down. My keeper rate is noticeably higher, and that to me more than makes up for the larger size and SLIGHTLY more limiting high ISO performance (still pretty good however).
 
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Interesting. I would argue the 1D4 has at least the DR of the 5D3. I personally for sports would go with a 1D4 out of the choices he listed. I think it would be easier to fill the frame and in day time the 1D4 has just as much DR as the 5D3. That's just my opinion.

Edit: I just looked at sensorgen and actually the 1D4 has better DR than the 5D3 across the ISO range. I guess the real issue here is cropping or not. I always felt the 1D4's sensor was absolutely phenomenal.
 
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