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what i desire is a full frame body that isn't focus limited. having to use center point only is very frustrating. just wondering if the D700 might be the ticket? i am satisfied with Canon glass.
If that's the case, the D700 certainly isn't limited to center point only Some people tend to hate the two-handed operation of the camera, but once you set up most of your options (like an Auto-ISo that's actually worth a darn), most of it comes pretty easily enough, and having actual metering knobs is worlds better than Canon's crappy toggle schemes on a lot of their cameras.
Really the D700 is an awesome camera, and if I shot Nikon again I'd probably get another one. I hate the sound of the shutter and the way it renders skin (and greens somewhat), but overall it's a great great camera and I love having a built-in flash (and commander) with the camera. Very good piece of machine. If you already have your lenses in Nikon mount and you're happy with them, you'll probably be very happy with a D700.
Purely IQ-wise, though, I still prefer 5D's output. As for 5D2, really a tough call if talking purely IQ. 5D2 tends to be a bit harsh when it clips highlights (maybe due to Canon's "black dot" fix? I've always wondered that), and the D700 is a bit more smooth when it comes to clipping specular highlights. Low ISO tends to also favor the 5D2 purely from a resolution standpoint (especially when you take D700's strong AA filter into account and the level of sharpening required to counteract it), but then again you can say D700's shadow raising ability is extremely good and mostly avoids the banding present in some 5D2 bodies.
Pick your poison