LOL! So now the 5D2 has less DR than my 7D???
I get so tired of faulty DR estimates. You do not estimate DR from any sensor characteristics you think you're accurately measuring by feeding a sample image to a black box computer program. You actually test DR with a transmission step wedge. If you do this properly you should get pretty much the same results that DPR gets using their transmission step wedge. (You can even buy the same one if you like.) I can replicate DPR's results. I can't replicate the results shown at this page, and intuitively know they are false just from day to day shooting.
The 5D2 yields 11 stops in RAW using ACR. The 7D yields 10 stops in RAW using ACR (and just about the same in JPEG via HTP). Since I don't see any transmission step wedge shots on that web page, I know I can safely ignore it, just like DxO's "estimates."
I'm very curious as to the DR of both the 5D3 and the D800. We'll know what they are when a site does a proper DR test. (DPR will probably be the first.)