Well, at least according to the folks at DxOMark, the people who test these things.
The D600 received an overall score of 94, putting it just behind the Nikon D800′s score of 95 and the D800E’s score of 96. The Nikon D4 only scored 89!
Click over to Nikon Rumors to see a chart of the current top 10 in DxOMark’s rankings. Nikon dominates the list with 6 out of 10 cameras. Note that there are no Canon cameras in the top ten (the Canon EOS 5D MarkIII scores an 81) and oddly there’s no Sony camera on the list either.
Of course sensor performance isn’t the only way to rate a camera’s performance, just a part of it. And at the end of the day, the person taking the pictures counts for more than the gear he or she is using. I expect that with the technology rapidly advancing, we’ll see lots of changes in this top ten list soon.