Originally posted by audiobomber First of all, I try not to use hightISO and I will use flash when it's appropriate to do that. Secondly, I expose correctly 99% of the time, so I don't have to push the exposure. The K20 has lower noise at ISO 1600 with the FA 35 at f/2 than the K-x at ISO 3200 and DA 40 at f/2.8. Aside from the high ISO difference, the K-x is very compromised for handling compared to a K20. The K20 image is more 3D too, IMO.
Avoid high ISO and use flash when appropriate: all well and good, but sometimes just not possible. I'd rather have the high ISO capability and not need it than need it and not have it.
Exposing correctly: have you noticed that the human eye/brain combination processes the dynamic range of a scene differently than a digital sensor? The "correct exposure" is the exposure that captures all of the data that you are trying to capture. That data can then be rendered later in a manner that most closely resembles the scene you saw. Sometimes that means a very underexposed-looking RAW file in the interest of preserving highlight detail. We're not shooting chromes anymore.
Lower noise from the K20D in that specific situation: again, depends on the photographic situation. If the scene has many shadows, the K-x will start to show its strengths. There are far too many different conditions that could apply to this comparison for it to really be valid.
Handling differences: certainly. The ergonomics of the K20D are something I truly miss. The 4.7fps and improved AF are nice to have at times, however. Anyways, it's not terribly relevant to comparisons of sensor quality.
"3D Look:" I'm not even gonna go there...