I've been using a 7D Mark II for about three years and the AF system is much closer to the world class AF system on my 5D Mark III (which is practically the same as the AF system in the 1D X) than any other APS-C camera I've ever used. It was extremely frustrating to fire off a ten shot burst and get 3-4 well focused images, 3-4 slightly out of focus images (evenly divided between front and back focused), and a totally blurry flyer or two, even when the target was moving at a fairly constant speed and direction. I shot with the 7D for 3+ years and the shot-to-shot inconsistency of the AF system was that camera's achilles heel. The flicker reduction feature Canon has included in several cameras since it was first introduced in the 7D Mark II in late 2014.More accurate exposure control with a color sensitive light meter.Autofocus performance (in terms of speed, consistency, and overall accuracy).The four areas where the 7D Mark II outclasses the 7D for sports and action (such as birding) are The 7D Mark II, in my opinion, strikes a better balance between absolute resolution and reducing the effects of moire. The low pass filter (anti-aliasing filter) on the 7D was a bit too strong. There's also a pretty good improvement in terms of low light/high ISO performance. The way the original 7D tended to jitter back and forth is not near as big a problem with the 7D Mark II.¹ As someone who has shot over 50,000 frames on each camera I can tell you that the difference is noticeable, especially when shooting in AI Servo AF mode. The biggest difference between the EOS 7D and the EOS 7D Mark II is the much more consistent autofocus system.
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