Interesting article on the D7100 and how the increased resolution impacts their lens ratings.
www.dxomark.com/index.php/Reviews/Best-lenses-for-the-24M-Pix-Nikon-D7100-Part-I
www.dxomark.com/index.php/Reviews/Best-lenses-for-the-24M-Pix-Nikon-D7100-Part-I