Originally posted by RiceHigh Say, the K100 and K200 share the same weaknesses: Smaller viewfinder, slow AF, small continuous shooting buffer (only up to 4 jpegs at 2.8fps) and so on. The pixel count is higher but not much more. You should note that you probably will get more noise with a more pixel count, however.
The AF is much improved - a poster at DPReview demonstrated better results shooting sports with the K200D than the K10D. It also has a faster write speed, so even though the buffer is relatively small it clears out fairly quick with a fast SD card. And the 10mp sensor definitely outresolves the 6mp sensor of the K100D, and the slightly higher noise at ISO1600 is more than compenstated by the greater level of detail. You also left out the weather resistant body (yes, needs a lens too, but at least they are available), improved AS, dust detection system (in use I really like this!), RAW button, sensitivity priority mode, and available battery grip. And coming from the *istDS, I was concerned about a lesser viewfinder too, but in practice I don't notice much difference. Your Mileage May Vary.