I am sure focus is quicker with advances in the field of microprocessing but just how quick do it need to be. My D2X can track a FAST jet at 650mph no problem and take a series of shots all in focus. In my field the D3 is no better than a D2X however wedding photographer would really benefit from full frame, excellent low noise and low light focus performance. I am sure there are other fields that the D3 will be better than a D2X but for me, D2X is probably still the best and in its fourth season.
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