The low light scene is shot with Auto White Balance, to show how the camera's JPEGs look under artificial light. Any 'keep warm tone' options are left at their default setting.
The low light scene Raws are processed to demonstrate the capability of cameras in low-light shooting situations. Noise reduction is minimized and the white balance is neutralized to reveal blue channel noise. The black level is lifted to prevent noise being hidden by clipping. A standardized amount of sharpening is applied in Photoshop.
The camera's default response is very red, but this can be toned-down using Custom setting 12. By default it's set to 'Subtle correction,' but the 'Strong correction' option does a nicer job (Click here to download the same scene converted from Raw with Strong correction on), and avoids the mistake Olympus makes with a similar setting of completely correcting for the light source, giving overly neutral images.
As the ISO rises, the performance remains very impressive. It never particualrly stands out in this company - and its JPEGs are perhaps a tiny bit behind the Nikon D7100's in terms of detail retension, but that's really because all of these cameras are performing extremely well.
In Raw noise in the darkest parts of the scene, is pretty similar to its competitors, with it showing a tiny edge over the Canon EOS 70D. At a common image size you can see the slight advantage it offers over the Olympus E-M1, but the main message is that the K-3 is part of a generation of cameras capable of image quality that was unthinkable until quite recently.