That's just really proving my point. the D800 is, by all accounts, a stellar camera. I'm not saying that because I think any canon shooter should switch, but I would think that people who unloaded all their nikon kit 2 years before might be kicking themselves. Same with anyone switching TO nikon now because they don't like canon options. And it's not easy to unload all your glass, buy new shit, and break even. If it were, people would be going back and forth every time a new body comes out.
Depending on how many lens you normally work with, it might pay to just own some of both makes