Pixel-peeping: Nikon D4 studio test samples at dpreview
Nothing cures a head-splitting weekend hangover headache better than intense pixel-peeping, so head on over to dpreview where they have published Nikon D4 studio-test-samples which you can use to compare the D4 to other cameras in the dpreview system. The aforelinked dpreview-prefilled comparison is versus the D3s, 5DMk2 and 1DMk4, but you can adjust it to your liking as long as dpreview has test-resulted your camera(s) of interest. You may also want to check the introduction & comments before & after checking the samples. There it is revealed that Nikon D4 and 85/1.8 real world samples are coming up.