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Basically, if I'm correct : the lower the standard deviation with phase AF, the more precise the AF is. The 1DX and 5DIII have a phase AF that's almost as precise as liveview AF, for example, according to Roger Cicala.
According to him, the 6D is as good as the 5DII.
Yes, I read this too and I asked Roger. Because according to the numbers of the presented graph it looks much nearer to 5D III than to 5DII for me (only center AF point was tested).