Originally posted by Adam It is better, specifically when the distance between you and your subject changes rapidly. The core hardware and speed remains unchanged, but if you find yourself shooting nearby wildlife, then the K-3 II's enhancements (also found in the KP and later models) will improve your keeper rate.
I have both the K-3 and the K-3II. Even though I use the K-3II for most things nowadays, I have to admit that in my experience, it's the other way around. My cameras perform about equally well with distant birds, but when I go out for close-by erratic birds (snipes and the likes) I pretty much have to bring my old K-3, or else everything becomes a mess.