I'm in agreement with @Btnapa; the KP has much higher resolution (pixels per square unit) than the K-1*, and way more than the K5s. I'm thinking, if I were in your position, the decision would depend on the present investment in lenses. If your lenses are all APS-C, then go for the KP; if you've already got FF lenses (or you're rich enough to go out and buy those in addition), then go with the K-1 (I also prefer that to the "Mark II").
I taught my kids a method of making such decisions: take a quarter, and decide which option is "heads" and which is "tails". Then flip the quarter and slap in on your forearm. Then observe yourself in the process and take note of which side you WANT to win and take that option. Never even look at the quarter.
* The KP's pixels are a lot smaller than those of the K-1, but there are more of them per square unit of surface area - being arithmetically challenged, myself, I relied upon @Clackers (who seems to know what he's talking about) for the conclusion. But see this comparison:
https://www.digicamdb.com/compare/pentax_kp-vs-pentax_k-1/. I really like the increase in image detail with the KP.