I agree that comparing viewfinder and Live View focusing is a good way to detect focusing problems. However when I sent that complaint to Nikon USA, they responded with something like because those are 2 different focusing methods, you should not expect them to give the same results. I might agree that in most images there could be a slight difference, but I was doing brick wall tests. When there is only one plane of possible focus, I don't see how there could be a difference.
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