Just going by what GordonBGood has researched and stated. (He designed the best known and most beloved hack to the K20D firmware to eliminate the high-ISO purple shadow problem - and is well recognized for his technical capabilities.) Here is his definitive explanation of the differences in the sensors:
Well, let's see - using PhotoMe (
PhotoME - Exif, IPTC & ICC Metadata Editor - use the Beta) to open raw images from the K-5, the K-01, and the K-30, we see the following:
a) K-5: raw dimensions 4992 by 3284 photosites, default image origin (22,10), default crop size (4928,3264), active area not specified but inspection with Rawnalyze or RawDigger shows top left corner (10,0) and bottom right corner (4960,3284).
b) K-01: raw dimensions 4960 by 3300 photosites, default image origin within the active area (4, 4), default crop size (4928,3264), active area top left corner (8, 20) and bottom right corner (4944, 3292) but confirmed with Rawnalyze or RawDigger to actually have top left corner at (8,12) with the bottom left corner at (4960, 3300). This is specified this way in order to shift the actually display pixels to those taken lower on the sensor in order to better centre the image in the image circle of the mount, but leave the photosites used to be taken slightly to the left on the sensor as that is closest to being centred already.
c) K-30: raw dimensions 4960 by 3300 photosites, default image origin within the active area (4, 4), default crop size (4928,3264), active area top left corner (8, 20) and bottom right corner (4944, 3292) but confirmed with Rawnalyze or RawDigger to actually have top left corner at (8,12) with the bottom left corner at (4960, 3300). This is specified this way in order to shift the actually display pixels to those taken lower on the sensor in order to better centre the image in the image circle of the mount, but leave the photosites used to be taken slightly to the left on the sensor as that is closest to being centred already.
Note that "left" and "down" are actually reversed on the sensor due the the image actually being imposed in reverse.
Inspection of the actual images for the full area of the sensor shows very different active area layouts as per the above descriptions between the K-5 and the K-01, with the K-01 and the K-30 having identical layouts.
This leads me to believe that the K-01 and the K-30 have a identical sensor, which is different than that of the K-5.
We have other reasons to believe the sensors are different in that the newer cameras offer video modes which are not possible with the maximum scan rates of the older K-5 sensor.
Now the performance of the new K-30 may not be quite as good as that of the K-5 with higher black read noise due to the faster clocking used for higher speed scans, but is likely to be better than that of the K-01 if one uses the optical viewfinder for still photography as then the sensor is not being heated by continuous Live View (LV) scans, but the performance is likely to be identical for LV mode of the K-30 (the K-01 doesn't have any other mode than LV).
Regards, GordonBGood