Sharpness is not resolution.
Sharpness is generally considered to be acutance, which is related to perception and the resolving power of the human eye and the way the brain interprets visual information. The K-5IIs may well have more perceived sharpness (acutance) in certain situations than the K-3, taking contrast, noise and cropping into account, but the K-3 would always have superior resolving power with the same lens attached. At the pixel level the K-5 has less noise than the K-3 and so the advantages (of k-3) may only be apparent at low iso's when extreme cropping is needed. All the same the ability to crop is almost as good as being able to afford a super telephoto:
Different images taken seconds apart with a D800e and a 70-200, the latter one being cropped to 100%.
PS: I have some images of one of my cats which look very soft when viewing the full image on screen, but when zoomed in you can see every hair (D800e); it can depend on the nature of the subject and the lighting as to the perceived sharpness.