I'll give you a hint. If you like full frame and what you can do and only do with an FF, go ahead and get the 5D.
That's what I did.
But I always considered my K20D may main cam, and now, with my K-7, the 5D is definitely my sub.
Here's what you will find out about the 5D.
The viewfinder is awesome. It's large. Makes manual focusing much easier than the stock screen in a K20D, for example. The K-7 screen is awesome (and it's 100%), so now I'd consider the two screens, neck to neck.
The full frame ness is AWESOME. It's like the resurrection of Jesus H. Put on that 50/1.4 you've had, and you will be like OMG OMG OMG... I can't believe how wide the FOV is.. and look at that DOF!!!!! Basically, anything to do with DoF, it'll look better on the 5D.
The LCD totally, utterly, unbelievably SUCKS HARD on donkey balls. It is a piece of crap. No, seriously, nothing, and I tell you nothing you take will look good on the 5D's LCD. You think you've just wasted your time taking pics, cuz they look like shit. Then, you transfer them over to your computer and they all look fine. Some, even great. Obviously, it's better than the other option (looks great on LCD, crap on PC), but jeez. It really hinders the cretive process, not to mention negates part of digital's advantage, if you can't get a good approximation of what you just shot on the LCD.
The lack of built-in image stabilization totally sucks. You wouldn't miss it if you go from your *ist straight to 5D, but man, the one month during which I only had my 5D to shoot with (sold the K20D, my K-7 arrived just 2 days ago), was at times painful. It's like the old days of film. Take your focal length, invert it, and that's the minimum shutter speed you're gonna want to shoot at (i.e., 1/50s for a 50mm lens). When you're used taking 1/15s and even 1/8s shots with a 50mm lens and often getting good results... well, you see what I'm saying right? So, obviously, high ISO shooting is much better on the 5D than the K20D, but these two pretty much cancel each other out (except for those times you have to shoot high ISO/fast shutter speed so as to reduce motion blur).
And, like you said, you will find that there are crucial lenses that are not compatible without some modding, either shaving the mirror or trimming the rear of the lens. Super Tak 50/1.4? Nope. Hollywood Distagon? Nope. Voigtländer Color-Ultron 50/1.8? Nope.
So, how I use my 5D is very specialized; I do my tilt shift on it; I use my Zuiko and Nikkor lenses on it; I do my spherical panorama on it (with the Sigma 8mm). That's about it. For everythin else, there's Pentax :-)
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