Originally posted by filorp Both of these still look a little underexposed.
Some people dial in +1ev for the K20D because they think it underexposes (mine seems ok). One ugly "feature" of the K20D is it seems to have a bit excessive chroma noise in shadows (the theory is it's because they used a 14-bit ADC instead of the K10D's 22-bit ADC) but it looks less blotchy than the K10D's noise. Also, the higher ISO you push the K20D, the more you have to get the exposure exactly right.
You should see roughly 1 stop improvement in noise between the K10D and K20D. Pixel peep and ISO1600 on the K20D should look like ISO800 on the K10D. If this isn't true, you should see if you can exchange it if you bought it locally.
I prefer using only ISO100-400 on the K10D and ISO100-800 on the K20D. The K20D's ISO1600 is ok in bright enough light, but I don't like how noisy it gets in low light (it's still ok when resized down so I'll use it if I have to).