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Doh! Now why didn't I think of that? Not only is the center AF square on his face, but it was the active AF point; and since DPP shows that it was shot at 1/8000, we can pretty much rule out motion blur.
Okay, this definitely suggests a front focus issue. Simple fix with an AF Micro-adjust.
But, the focus point shown in DPP does not necessarily indicate which point was actually used if center point expanded to surrounding points is being used. If that mode was being used, the center point would always show up in DPP even if one of the surrounding points was actually used. In the case of this picture, one of those surrounding points is, at least, partially on the man's knee. And it could well be that there was slight movement in the camera between the time that focus was established and the picture was actually taken. Thus, it could well be that the focus point was squarely on the knee when focus was established.
I'm not sure that I can have much confidence in guesses about front or back focus (or other focus issues) without seeing some testing in a more controlled situation.