Originally posted by m96 Clean image.
But by "no post NR" do you mean (a), you let lightroom/your-poison-of-choice do its default NR that you didn't adjust any further, or (b), you processed the raw file with such raw processing software that absolutely allows the user to disable all NR?
LR doesn't apply any luminance NR on import as far as I know, but does set color NR to 25. Move the slider to 0 and that's off too.
Not speaking for Kobie, but I use the LR defaults, therefore it would show results the same relative to your own camera/brand if using Lightroom and defaults. The K3III has given me the best low-ISO performance of any camera I've owned to date. My own acceptable upper range tops out at that 25,600 which is very workable in many cases considering modern software, tho I tend to set it at 12800 max for nature stuff. I do a LOT of early mornings.
EDIT: So out early this morning and discover I had set the max ISO at 25600, and apparently at least a couple of weeks ago. So there you are.
Pentax has outdone themselves tuning the performance they squeeze from the hardware.