It would be foolish to come to any conclusions before several endepth reviews have been published about the 5DM2, and comparisons between it and the D700.
I am guessing here, but I strongly suspect that when it comes to image quality (and features be damned) the Canon will win. If the noise levels are the same or very nearly the same, then go for the higher MP's.
Don't let features destrict you from image quality, which is the prime directive.
Now if you shoot journalism, sports, maybe my criteria is not the best....
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I'd take the opposite approach - while I think the 5DmkII will be an *awesome* camera for a low ISO landscape/studio shooter, I still think there will be a divide between better real-world hi ISO performance and dynamic range (which the D700 or D3 will have an edge) and resolution (which obviously the 5DmkII will have an edge).
I seriously doubt in every aspect of image quality the 5DmkII will automatically be the best camera. So which body is right for a user isn't going to be a slam dunk and it's still going to involve some choice. While Canons sensor development is quite good, I just don't see them instantly making up *that* much progress (in the divide between low pixel density but high DR and pixel quality vs high pixel density and high resolution) to be able to provide a D3-like tonal, DR, and hi ISO performance in a 21mp body. We're not quite there yet -maybe someday, but like you said, we'll see once the tests and real-world shooting experiences come out.
I also feel that when you're talking about something in the 21mp arena, lens, support, and shot discipline are so amazingly critical in order to take advantage of all of that resolution and many folks won't even be remotely near extracting all that resolution when they shoot. I'm not so sure that Canons wide glass is of the quality neccessary to fully take advantage of that level of mp at this point either.
Either way the 5dmk-II looks excellent - and thus it should put some pressure on the other guys (essentially meaning Nikon) which ultimately benefits us all.