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Mk3 vs Mk4 vs 7D - IQ:Noise
Got lucky and managed to pick up one of the first Mark 4's released here in Ontario this week. Too cold to find any birds, so set up some comparative test shots. All three cameras were re-calibrated for AF, used a 400mm DO on a tripod with timed shutter release, focus set/locked to manual after 1st picture, same exposure settings in all 3 cameras based on settings from Mk3. The images are at 100% (250px by 250 px) with NO sharpening applied.
Initial reactions : 1) the Mk3 and Mk4 do not have the same crop ratios! 2) Unlike suggestions in prior thread, noise levels on the 7D are NOT comparable to the Mk4. The differences between the 3 cameras are readily apparent when viewed at 300% . 3) Images on the Mk4 and 7D are slightly "softer" than the Mk3. 4) Not as readily evident on this comparison, there's also a slight exposure loss with the Mk4 and 7D.
Hope this helps anyone still undecided between the 3 cameras.