Upload & Sell: Off
I'm a turncoat who bailed on Nikon in 1999; have been shooting Canon EOS ever since, but as of today (with D800E pre-order) I'm coming back. The 5D2 is a great camera for 2008, but this is 2012 and the 5D3 is nowhere to be found. Even more disappointing is that the rumors suggest the 5D3 will have about the same pixel count as the 5D2, perhaps even less (like the 1DX). So I'm coming back to Nikon. But there is more to it than that.
Everyone knows that life is not exclusively about pixel count, but it is equally foolish to say that pixels do not matter and that 10MP is all you really need. For my purposes, a high pixel count is highly desirable. There are things out there that 21MP just doesn't pick up. Canon seems to be marching in the other direction, suggesting that fewer pixels are better and that their "magic" pixels are worth more than regular pixels, if you're inclined to believe such nonsense.
It will also be refreshing to have an AF system that might actually work. I wouldn't know what that's like, since I've shot with a 5D2 and 1D4 the past several years; neither of which has AF that works well enough for my needs (I use MF with live view). If the D800 has usable AF, so much the better; if not, no big deal.
It will also be nice to be able to use decent wide angle glass on the system it was designed for. Although I truly love Canon's big telephoto lenses, everything they make shorter than 50mm is pretty much junk by any reasonable standard. I think nearly all landscape folks that shoot Canon have been very envious of Nikon ever since the 14-24 came out several years ago. Canon seems unwilling or unable to do anything about that.
Canon just doesn't seem to understand that not everyone is interested in video, and not everyone is a sports shooter or PJ. They used to get it. The 1Ds was truly revolutionary back in 2002. It makes me sad to think how rapidly Canon advanced from 2000 to 2002, but has done nothing in the past 4 years. Nikon, I think, gets it; or at least, that's how I read the D800 release. And for the sports guys, there's the D4. Canon left the landscape folks high and dry when they effectively abandoned the 1Ds3 and (apparently are failing to make the 5D3 a competitor to the D800).
But as I said at the beginning, I have no brand loyalty. Both Nikon and Canon make some fine equipment, but it's important to go with what will work best for your needs. I sold off a huge Nikon system in 1999, so it should be no problem to sell off an even bigger Canon system now. Thanks to inflation and used equipment, I might actually make money instead of losing it (except for the bodies).
Let's just hope we can get our hands on the D800 in a reasonable time frame. I have a suspicion that Nikon grossly underestimated the demand for these. I hoping to get mine no later than August.