Originally posted by newmikey In my experence, the move from the K20D to the K-5 was more of an evolutionary one than a revolutionary one, even though there are many improvements. I would at least go for a K-5 IIs or a K-3 which can both be found for a steal. The original K-5 had a couple of quirks such as slow and unprecise focusing under indoor lighting. Also, the K-5 IIs and all of the bodies which came after finally lost the AA filter in front of the sensor which caused detail sharpness to jump.
What?! nono...if there ever was a revolutionary step between any generation the K5 was it! The aa filter was a little improvement for certain max sharpness cases, K3 had more pixels but less DR and ISO, and KP/K1 etc are just marginally better if looking at per-pixel properties. Yes, larger improvements in AF, Astro, etc, but the IQ itself, nono, the others were the evolutionary there.