Quote: Here is a real world review of D7200 (you can use google translate if you want to read the words). Find me a similar review for K-5 II or K-3 II. K-3 II has a better af-c than K-5 II and for occasional action photography it's enough.
Absence of evidence is not evidence of absence.
This guy has incredible tracking skills just to keep the bird in his frame. Who knows what he could do with a K-3? Speculation is futile.
Although in this case, what Dan is saying is probably correct... but bottom line, you probably aren't going to get images like he posted whether you have a K-3 or a D7200. And if you can keep the bird in the part of the frame covered by the AF grid, you can do quite well with a Pentax. See Kengoh's images in the 300 plus cub.
Or images like the owl in these threads. If these images are good enough for you, you don't need a 7200 for tracking.
The 300mm plus lens Club discuss your long lenses. - Page 1651 - PentaxForums.com
After all, give any college basketball player a good basketball an he'll hit 6 or 7 out of 10 from three point range using beat up old ball. I might get one, using a better basketball. Does that mean the old ball is better? Or that I could do better with the old beat up ball? If I'm not a good three point shooter it doesn't matter what ball I use, I'm going to miss a lot.
ANd if the active player is a good shooter, he's going to make his shots with whatever ball he uses. Cameras are little different, except for the part where way to many people show what some guy who's picture they could never match with any camera as proof of how good the camera is, without reference to how good the shooter is.