OK, I did one more test that you pay prefer. This one has the following conditions:
-f/16 to get max DOF and eliminate any concerns about NR smearing vs lens blur. I also used my best lens on each camera: the DA70 ltd.
-AB800 studio strobe lighting and X-sync on cameras at the exact same power settings to make the lighting consistent.
-Scene selected that has a lot of detail, and a lot of contrast so you can see noise in shadows. The histogram runs from almost saturated, to almost black. There is a lot of detail in both the light and the black (eg, black wood grain)
-all 4 NR settings used on each camera. An iso 100 is also shot for a "noiseless" comparison.
The full set with all user NR settings is in the original folder (feel free to download, and crop, etc.) :
K-7 and K20d Iso tests - a set on Flickr
Teaser pics:
(Note that below i show the factory default NR settings for each camera since the user NR setting is relative. "NR off" for example, does not mean that there is no NR done in the camera image processing.)
K-7 iso 100
K-7 iso 3200 default NR:
k20d iso 3200 default NR:
My conclusion? Dang these cameras have good high iso performance (when properly exposed)