The K5 (Touch) has a matte finish on the screen, so you do not see reflections, and you do not see fingerprints (even when you have greasy fingers).
EDIT: Okay, if you intentionally hold it so you see refected light (which I automatically avoid) then you CAN see a very blurry reflection of the light source AND greasy fingerprints. I hold mine such that I do not see any reflections so I do not see fingerprints, but outside in the sunlight it may be more of a problem, as Pomtroll said in the next post.
Because it uses Infrared light in the bezel above the screen to sense your finger touches, it can see a touch when your finger "almost" touches. You need to be careful when touching it that none of your other fingers are not "almost touching", or it will figure that you touched it at the midpoint between the two fingers.
Once you know that, it is easy to avoid it by keeping your other fingers up out of the way.
To turn a page, you can just roll your thumb slightly over the bezel edge toward the screen while holding it. It is easy to get used to that while reading so that it does not distract from the experience.