Originally posted by CapitanXeon It's just like if there was a constant blurryness of a single pixel that, while allows me to take completely fine pictures, the finest of the finest details can't be catched.
Ummmm...while some bloggers go on about sub-pixel resolution, there are only pixels and they are ALWAYS fully discrete and whether they might be used to render a portion of an edge (the essence of what we deem detail) is partially a matter of probability In short, if you can see the pixels, you are not seeing the image.
As far as your K-5 is concerned, if what you are seeing with your best efforts with a particular lens has lower quality than what you expect withing the frame, there is little you can do other than trade up to more pixels with that frame and/or opt for the K-5IIs without the anti-alias filter. Notice that I did not suggest buying a better lens. Unless you have been cheap in that regard, most quality glass available to fit your K-5 should be capable of meeting the challenge at 16Mpx as well as that of a higher resolution sensor.
Steve