Ask DXO, we do not know how they arrive at their figures, their results are often suprising.
Alot of people have called DXO's findings into question since the whole D800 vs. 5D MkIII dynamic range thing, but at least one person who was a disbeliever seems to have found that the whole D800 high DR issue was quite a good reflection of real life:
"I did attempt to disprove the high DR talk, only to find out that its all true, I could not blow out one area while retaining detail in the shadows, I was suprised to say the least. "
Who was that again?
