I hope this works...
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I can only think of two aspects of the 6D that qualify as limitations: the AF system and the frame rate. The frame rate might not be 1DX speed, but it is fast enough to be usable to get great shots, even for sports.
The question is not which one is better. There's no question that the 6D is outclassed by the 5D Mark III and the 1D X. The question was whether it has serious limitations—that is, if there are aspects of it that would prevent someone who knew how to use it from being able to get decent shots. Personally, I don't think so.
What I was trying to show was that the AF accuracy at f1.6 was way more than f5.6. To this end the 2m dof was 'very narrow' compared with the 12m dof that f5.6 would have given.
The examples were in reply to the comments you made about this, and could be demonstrated by attaching the very small, but fast loading files.
Thanks again for the sample shots and all your work on this topic. Your samples match my experience with the 6D AF. Its very precise and accurate for non-action photography and works well with wide apertures.
The thing about the non-center 6d points is that they're "nice to have" and a convenience, but hardly necessary: They only have f5.6 precision, meaning you shouldn't use them with a faster lens than for example your 24-105/4 and go for 100% crop viewing/printing. But at this dof, focus & recompose would most likely achieve the same result.
1) That the AF works for still life
Out of 4 pics of the kid playing, you only captured two where we could see her face. My guess is that was partly because of sluggish AF, but perhaps you had artistic intent, who knows.
My prediction: The 6D will have one of the shortest production cycles of any Canon SLR. Perhaps THE shortest.
Nobody thought the 6D was well thought out for any level of photographer, except, maybe, those who do a lot of arranged and found still life on tripods and could use Live View most of the time. That's too specialized for success.
Any experiences, help or advice would be appreciated.