I don't own a K20D and have no way of performing any sort of scientific test, but I can say based on some experience that they are more similar than different - which is to say say, both are far faster than msot P&S cameras, not quite as fast as some other DSLR's, but that the focus speeed also depends a lot on the lens used and the levels of light.
As for which camera to get, as I see it, you have two chocies: a camera with SR, or a camera in which you get way more blurry pictures than people with SR get. Aside from that, there are few or no technical differences between cameras worth worrying about.
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