Quote: The 14 bit RAW files make a pretty big difference at higher ISOs. Comparing the K-30/K-50 12 bit files to the K-5 & K-5II 14 bit files,
Interesting, I found just the opposite. I couldn't tell the difference between my K-5 and K-01 files. In fact i have and others have compared K-01 images to D800 images and seen very little difference, maybe a resolution difference, but no difference in preference as to which folks liked to look at. Higher resolution does not necessarily translate into a more pleasurable viewing experience. Something the technogeeks tend to completely ignore. And if you can say that a bout a K-01 and a D800, you can definitely say that about a K-30 or 50 and a K-3. I use the K-3 for wildlife and birds, because often by the time the shutter goes the creature has moved, and I'll need to crop. Often in those circumstances you don't have time to frame as tightly as you'd like.
I did look at a D610 once, it was nice, but then the K-3 came out and it didn't have nearly as much to offer with the K-3 being such a dramatic improvement in AF. The low light performance is only improved if you are willing to accept (or want) narrower depth of field. People tend to ignore that. Same DoF, same low light performance.
I do know I don't like the 1EV loss in Dynamic Range between a K-5 and K-3. The 16 MP sensors do have their advantages.