Downloaded the (35MB!) 1600 ISO K3hSLI01600NR0.DNG.
I was happy to see that my Lightroom 4.4 does a good job with the 1600 ISO DNG. No problems with the red swatch AT ALL. Good detail too all over the place. LR will probably do even better I expect once Adobe profile the K-3. Re-assuring
Looking closely at the DNG, at 100% view noise levels seem higher than the K-5, noticeable in the grey cardboard surrounding the small colour board at the bottom of the test scene. But I have to keep reminding myself that looking at these larger images at 100% and making comparisons with the smaller images of the K-5 is not the way to do it.
It is a pity that the JPG out of camera in the IR sample munges the red details of the patch so badly past about 800 ISO. However, it is worth noting that the Image Tone setting in the test scene JPG is the default 'Bright', which also means contrast and sharpness are bumped, and that colours are adjusted. Perhaps the 'Natural' in-camera JPG image tone would show the swatch better. Either way, the results of processing via LR are much better quality than the in-camera JPG.