Still using the K-3 I got in mid-2014, my only camera. Has never let me down and keeps taking amazing images, as long as I'm doing my homework as the photographer behind it. High-ISO capabilities of something like the KP are better of course, but it's not that you can't take great images with the K-3 even in low light (especially compared with the K-7, which I shot earlier).
Am quite curious about the new APS-C flagship Ricoh seems to have in the works and, if it delivers the goods, will likely upgrade to it, once it has been on the market for one or two years.
The last image I have of our late doggy dame Mora, done with my K-3 and the plastic-fantastic DA50. Image quality is still impeccable, even in 2019: