Originally posted by Dan Rentea K-3 II autofocus is better than K-5 II autofocus when comes to tracking . I had both camera and there was a visible improvement in Af, no doubt in this regard.
I can't contradict you, as I haven't used the K-3 II, nor the K-3 long enough to form an opinion (and I trust your assessment). I will say, though, that what I found myself really wanting in the K-5IIs regarding tracking was a way of distinguishing the subject from the background. The K-3 was the first Pentax which introduced that.
As for the comparison with 7D-series cameras, unfortunately I don't have enough relevant experience with those, either. Regardless, I didn't expect Pentax to be able to get to that level - which means camera and lens-wise - on their first try.
The K-3 is just a first and very significant step regarding advanced AF tracking. Expect progress, but Pentax/Ricoh will play catch-up for a while. It isn't easy.
Getting back to my point about price, one thing Canon and Nikon had but Pentax hadn't was a higher end, higher margin camera on which more expensive technologies can be introduced, tweaked, tested - with the results trickling down to more affordable products. The D7200's 51 points AF is the result of what was done with the D3, D300 and D700.