The only way to get decent images out of the K-7 at high iso is to shoot in RAW and process with a decent noiseware like NR program. Now, that you mention that some processing is ok, here are some sample I just took. The brighter one was taken last night and the second one (darker subjects) just a minute ago. Shot in RAW opened in Rawtherapee and removed color noise, opened in CS2 and processed in Noiseware (basic processing with preset option, no fancy masking), then one application of USM. Exif intact.
This takes less than a minute of processing, and is not ideal but quick and dirty test samples in poor light (check the exif, both shots hand held).
These are iso 3200, IMO not horrible but nothing to brag about.....IMO, I wouldn't upgrade from K20D to K-7 for high iso performance. The only reasons I can think of is overall ease of use in being a smaller package and in being more responsive.
The IQ at high iso sucks in every camera, it is just a matter of which one sucks less. So, I rather get a camera that does well in low iso, where the IQ is at it's highest. A couple of quick samples at lower iso's.
This image shows detail in the white feather (taken last wknd.)
This one for overall rendering (Was taken on my frist outing with the K-7_
The biggest asset of the K-7 is that it makes photography fun,...it's got the ease of a point and shoot and the speed and control of a top end DSLR.