Welcome to the Forum!
I recently upgraded from the K-S2 to the KP and I'm glad I did. I was really happy with the results I got from the K-S2, but it developed the "dreaded aperture block failure" problem. While it was away for surgery, I had a chance to try the KP and was quite impressed. Now that I've bought one, my "impressedness" has deepened. Things I like over the K-S2 are, better high ISO performance, better IBIS (both of which I noticed in my initial trial of the camera), better control layout (the third e-dial is brilliant!), nice, dense feel and build. I haven't yet really tried out some of the other added bonus features like Pixel-Shift Resolution, Night mode display and the battery grip (an add-on I bought which will help out with battery life, see below).
Here's a link to a whole whack of threads on the KP specifically:
Pentax KP - PentaxForums.com
There are also extensive threads featuring lots of shots taken with specific lenses (eg
16-85,
18-135), lens lines, (
Takumar,
K,
M,
A,
F.
FA,
DA) dedicated clubs for particular focal lengths, subject matter, themes, techniques, etc. You can see what other people have been able to do with pretty much anything made by or for Pentax. Lots of great advice and troubleshooting help, too. The Pentax Forums site is a wealth of information, support, and enthusiasm which I have found invaluable. As you've already seen in this post of yours, you can get a lot out of it, just by asking. I hope the information you get from here lets you make equipment decisions that best suit your needs. It's certainly helped me in that regard, as well as allowing me to get even more enjoyment out of my photography while enjoying the results of other people. We welcome your input, too!
As to the controversy mentioned above, there were/are several. At the time of the KP's introduction, many in the Pentax community had been wanting a K-3II, APSC flagship model successor. At one point, possibly through misunderstandings about Ricoh's intentions for the APSC line, or mixed messages from Ricoh itself (I will leave it to others to give a definitive call on this), the KP was seen/prtesented/interpreted to be this long-awaited K-3__ camera. For those waiting for or expecting a "flagship" model, the KP fell short on a number of fronts; no top deck LCD, no second slot, shallow buffer, lower than desired battery life. This, I believe, is what generated whatever degree of controversy which arose around the KP. None of these things (except perhaps battery performance) were really relevant for my needs. Of course, your mileage may vary. Figure out what's going to work best for your imaging needs, budget, and style of shooting. If you can preview or handle the gear you're considering, so much the better. Feel, weight, balance, and control layout aren't things you can experience online.
Enjoy your stay. Hope this helps!