I just managed to pick up the K100D and it appears to be a good camera. Images are OK but battery life is a bit short when you are using flash or leaving the shutter open long periods of time. The good thing about it however is that the shake reduction is built into the camera so you can get SR with all lenses. Another is that the focus mechanism is in the body too, so the lenses are lighter.
That all said, until I get use to it, its not a mark on my S5600...