The slightly lower scores from the K-3 mean it ranks slightly behind that of its closet rival bearing a similar 24-Mpix sensor, the Nikon D7100, but it fares well against the Canon EOS 70D.
The Pentax has +2/3 stop improvement in color depth over the Canon but around -1/3 stop less than the Nikon. Bigger differences can be seen in dynamic range where the K-3 has almost +2 stops advantage at base ISO over the Canon, and just less than -1/3 stop compared with the Nikon. In low light, the capabilities of the Pentax and Nikon are equal but you would be hard put to tell the +1/3 stop gain over the Canon in real world use.