I know a lot of folks claim DP Review is sometime biased to Nikon in its review and I always thought this was odd, until now with the 5DmkIII! Have you noticed that both the D4 and the D800 have been updated with sample ISO shot that we can compare with any camera in their database...except the 5DmkIII. Ok you may say, they have not done the review of the 5DmkIII yet...but then why is it that they actually did produce some ISO shots with the 5DmkIII BUT they did so in a different setting as their usual ISO shots and as such we cannot compare them to their database...and the D800 and the D4! For now the only comparison with the D800 you get when you load them is with the 5DmkII!!!!!
Call me paranoid this morning, but this suggest first they are biased toward NIkon, and that the 5DmkIII likely kills the D800 in ISO performance dispite the various internet report saying it is great at ISO (the D800 that is).