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Does pixel size have anything to do with the 'quality' of which you are considering.
Will the lack of AA filter with the 7100 produce images that are sharper or better quality than the D800? What about dynamic range, blah blah blah.
How does one define quality, blah blah blah? The D800 certainly has a higher quality build.
It's subjective, but I'm sure there'll be a DxO score thingy soon if there isn't already?
I owned the D7000 and thought it was outstanding. I now own the D800 and the IQ is incredible but I don't seem to have the same love for it. I haven't tried the D7100 but in my opinion it's one of the greatest cameras Nikon have produced based on features, size, price, and possible IQ based on the sensor details and lack of AA.