Clarence, I can tell you where it sets with me.
I have the 5D Classic and the 1DM3, and to me it's a winning combo. If you do much wildlife or sports/action stuff, the 1DM3 is a true workhorse. Plus, like Perry points out, the AF capabilities go beyond just those things -- many people prefer it because of that for things like portraits and weddings. And, the MkIII has fantastic low noise/high ISO performance. It's one of those cameras that truly can do most things very well.
That being said, and this being a 5D Classic thread
, I use my 5D plenty, partly because I like the FF format and also, a big part, is that it is more portable. I'll consider getting the 5D2, since there is nothing lost with that camera and are gains in resolution, noise, and features, but I'm quite content with the Classic and prefer it over the 1D for things like scenic/landscape photography and street photography, some event photography, and the type of environmental portrait photography that I do sometimes.

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