RAW-Shooter wrote in post #17786752
I couldn't disagree more....shooting mine with the Canon 100-400 Mk 1, Canon 70-200 2.8 Mk 2 and now with the Canon 100-400 Mk2 and the camera rarely misses a beat.
There is something weird going on with yours.
The differences in micro adjust values is completely irrelevant and it is absolutely normal to get different values when mounting lens X to different camera bodies.
I too would have to agree to disagree also. The one thing the MkIV was made for is action - fast action - and it does not disappoint. The only time I find mine struggles is acquiring focus on low-contrast moving subjects in low-light, whereas the 6D has the advantage in low-light as I understand it. I have a number of zooms I use on this body, and all produce very sharp results. I in fact was completely blown away with the results from a recently acquired Sigma 150-600 Sport, as I was worried about image quality having been spolied with the 70-200 IS II. Very impressed with the 150-600 results and am actually considering picking up another MkIV as I have a 7D and 5D that don't see much use anymore as my 5D MkII is brought along as back up most often. Wouldn't trade my MkIV for much, other than maybe a 1Dx