Wading in again with my opinion.
I've shot Canon for decades, got into Nikon a few years ago because I don't like the limitations of Canon's sensors in some situations.
After enough prodding and testing I gave Pentax a try.
Gotta say, my K-5 IIs is my favorite camera right now, much as I still enjoy my d800e.
On my Pentax wish-list is a FF body. Can they pull it off and still provide good SR with the larger heavier sensor carrier?
Also on my Pentax wish-list is more versatile AF. The current system in the k5ii is PDG, especially in low light, but more points and faster overall focusing would put the thing into a better position for action or faster paced shooting that some people would prefer. E.G. The D5200 seems to have a pretty capable AF system for a consumer body.
Metering... I don't know what it is about Pentax metering but it's not like what I'm used to on Canon and Nikon! I find under-exposure is a common issue on all my Pentax bodies and matrix and CWA metering is less predictable than it is on my Nikons or Canons. Perhaps I just need to finally clue in to WHY it produces these different results and learn to accommodate the difference but so far I find myself reshooting and bracketing far more with Pentax than I used to with my other gear.
In the end tho, I really like the results I get from my Pentax gear and that's where the ink meets the canvas.