One think u can do for sure is to get rid of canon system and get nikon. One thing is sure for me. Nikon AF, despite faulty D800 units is way better in almost every aspect. I know what is 5D3 in specification list (61 points, many x type points etc.) but try it with one of the outer x type focus points or with center AF under bulbs or fluorescent light-BF or FF. Outer points with mojority of lens just do not wrok (FF) I have one 5d3 and test two other, different 5d3s-same thing. Reviews and other tests don't shot that. U still has one point in reality. I spent a lot time on testing, trust me or not. Tested different bodies with different lenses, spoke with other users. The new AF system is ok if u use it with center AF, under daylight, with lens adjusted to specific distance, and if the lens are 2.8, if u change one of those factors-it will just not hit the target. That's not the AF system I thought I had paid for. I know how it sounds but it is true, regardless all reviews. Same thing about 6D. AFMA and other service adjustments are useless when u change environment a bit. Check any 5d3 or 6d, LV vs phase detect, then do same test with other camera producer.