D800 - buy 16-35mm f/4 or 17-35mm f/2.8

You can select your body and any three lenses to see their lab test marks side by side.
Go to: http://www.dxomark.com/index.php

I bought the 16-35 f/4. Several reviews have said that the 17-35 is past it's prime; great in film days, but large digital sensors reveal issues.
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