That means the D800 at ISO 200 is generating images as good as the 5D2 at ISO 100.
Wow - huge!
I do not believe for a moment that this is a game-changing or deal-breaking difference for anyone
- it's just fodder for whiners.
Besides, at the risk of rolling out a hoary old cliché, it takes a damn' sight more a stop of DR more or less at low ISO to make the difference between a "good" and a "bad" image. I'd go as far as to bet that for 99.999% of users out there, it will make no practical difference whatsoever
Seriously, it boils down to this: if an extra stop at base ISO really is
"everything" to a photographer, then maybe the 5D Mk III is not for them: but I guarantee
that the rest of the planet will be able to churn out spectacularly fine images in their millions with the 5D Mk III. This forum is getting depressingly like DPR in terms of the obsession for measurebation over end results...