Upload & Sell: Off
This is why I am still mad at Canon. Very, very expensive upgrades that often do not actually feel like upgrades at all in some functionality respects. Sure it has more AF points, but in the end I am sometimes forced - out of necessity - to take one good, fast AF point (5d2 center point) over a bunch of slower and less reliable AF points (all 5d3 points) during receptions.
As I said, my 5d3 results are quite different in daylight, where all the points perform pretty well, track fairly well, etc.
The last wedding I shot, I used my 5d2 - in AI Servo - to track the oncoming wedding party for the grand entrance. Out of all the bursts of tracked shots (about 30+?), it probably misfocused one or two. I can say with confidence that, if I had used my 5d3 for the same shots (using the same lens, with the same light levels), I would have had so many out-of-focus images that it would've made the culling process infinitely easier...and some of the wedding party pairs might have been completely missed/OOF as a result. I couldn't afford to take that risk, so I went with my tried-and-true 5d2s, and they did NOT disappoint me.
Also, based on the results I am describing (hardly any misfocused 5d2 AI servo images for a grand entrance), I posit the idea that it is not necessarily my technique that is lacking/causing so many misfocused images with the 5d3, since the same technique is leading to many in-focus images with my 5d2s under the same circumstances.