Yes, I'm sure there are some people with valid focus issues, I don't want to minimise the problems they have had, but my own experiences would relate to my own user error.
It would be a pity if this whole thing got blown out of all proportion into some emotional thing which damaged the reputation of this excellent flagship camera.
12MP is hard to handle, and in my own case any focus issues have been related to camera movement. I don't do measurebatory tests, though, I just take pictures and usually ones in the field that are all handheld. When I'm not in a rigid frame of mind I do get issues..I've just taken to using ISO200 to get a bit more shutter speed which delivers great results. But I can get pretty poor results too if I'm not steady at ISO100 in the field.
Interestingly, I've noticed that the extreme right of my images are bit OOF with the 17-55mm even when focused on centre and not with other lenses. There must be some sort of lens QC issue which is evident at that resolution but it's not significant.
I think the camera requires discipline and excellent technique. That doesn't make it a camera with issues, however, it makes technique all the more impoertant, just as it should be.
Again not to minimise those who have had issues, but to hope that this doesn't become the sort of emotional issue it was with the D70 (backfocus), or the D100 (remember the soft images issues) the 10D (also focus) and to some extent the 20D.
It seems to me with every new DSLR there is a plethora of emotional stuff, that hopefully and usually disappears with time.
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Peter Bendheim
http://www.imagessouthafrica.co.za