"In effect, what this means that even a photo of a blue sky and beach (no shadows or anything) is going to be cleaner on the D800 than the 5D3, even if the signal drowns it out."
Aren't you saying this is a problem, and it's in every picture? While I do have more Canon gear than other makes right now, I'm no fan boy. They have been on the back foot with Nikon since the D3. After a week or using my mk3 i've pulled the fuji 6x9 off the shelf. Or maybe i should use my pentax, graflex, or panasonic, or...
I think this competition is great. that sensor is great. Sure i see the shadow noise in these comparisons. it's an order of magnitude better on the nikon. Cool, I want that. Get to it Canon.
I can't help but wonder, once Sony gets a tighter grip on the market, would you want to be Nikon?