Here is the same scene at iso 100, no NR (of course) and sharpened with USM the same way as above.
Can see the dust on the shelves, the silver rods keeping the shelves together shows the stippling, and the LCD shows the true sheen that is present. So, obviously nothing replaces low iso for detail. When I want to enlarge a print I want all these critical detail, and only iso 100 gives that. When all this critical detail is not necessary as in 5x7 prints, then the slight differences in high iso performance becomes totally irrelevant too, thus my desire for ultimate low iso performance rather than subtle differences in high iso performance.
I have to somewhat agree with Javier with high iso. Yes, RAW iso may be pretty good, but why is the jpeg iso so weak. And RAW is good compared to k20D and other earlier model. But, this is supposed to be the 'improved' sensor?, in what sense is it improved ? Remember the days of leaking high iso images just prior to the release date., The majority was downplaying the lousy JPEG high iso images with the early firmware saying there will be an improvement with the final firmware. Even Pentax implied there will be an improvement with high iso when they banned any publications of high iso images with the early firmware. To me there was no improvements with the current firmware compared to the leaked versions. ok, the RAW is same as the sensors released before, including the K20D, but is it all that evil to expect an improvement with a newer model ? May be we've reached the peak of high iso performance for APS-C sensors that has base iso of 100. Even the recently released Nikon D300s is using the same sensor as the D300 and is not expected to have much better high iso performance.
So, in summary I think ideally the K-7 which is the newer camera with the 'improved' sensor iso should indeed be better than what it is at high iso...but, this is not to say I don't like the K-7, I love it....