When will this debate go away? The D800 has one heck of a sensor that can pull a staggering amount of shadow detail. Canon boys need to accept this and move along
If it makes you feel bad, buy a D800.
Personally, I very rarely have the need to push the shadows that much, and the 5DIII is a better balanced machine for my needs. I just don't see why I should get upset about one aspect of camera performance (DR) that doesn't affect what I shoot all that much. Sure, more DR would be nice, but I can work around my Canon's limitations and the areas in which the 5DIII excels outweighs its DR disadvantage for my usage.
I understand that landscape photogs need all the DR they can get. I also understand that all of a sudden everyone seems to be a landscape photographer. Many of these self-proclaimed landscape photogs don't have portfolios or sample images that show how much their images would benefit from improved DR, but what do you expect on the internet
So if DR is that important to you - whether it's for practical reasons or just to placate your ego - admit that Canon is inferior at the moment, and buy yourself a D800