If convenience, most slender compactness, lowest overall weight, portability, most versatility of use, and pretty good quality, but- with much less control, will do the trick- just get the latest, greatest phone.
If someone has designated the Fuji system, especially the new XT-3 as the best-ever APS-C camera, just get one for that reason. Fuji has long made good cameras of various types, and that system has a few outstanding compact lenses. Nothing new about getting a particular camera to make use of a particular lens, regardless of what other equipment is owned.
I took a good look at the XT-3, and for me there is no comparison between it and my KP. Features- one of many being a built-in flash, controls- one of many being 1/3 stop shutter speed jump availability vs. full-stop, and other shooting adjustment capabilities, are way ahead with the KP. Then the lack of SR, and at a very comparable size, all present absolutely zero attraction for me regarding the Fuji alternative. But if that is what someone wants, that is what they want. As to size and weight (which are overall comparable), they must not forget to always have their tripod, or at least monopod along, if not only shooting in bright daylight.
---------- Post added 12-03-18 at 06:14 PM ----------
Originally posted by Rondec The tough thing is that a lot of the best vintage K mount glass is screw driven and that means either a really expensive adapter or losing auto focus capability. Canon has it "easy" since all of their EOS lenses have in lens motors from the very beginning.
Anyway, I have little idea of what the future holds in general. I just know that Pentax has told us over and over that they aren't doing mirrorless. Obviously that can change at a moments notice, but for now they seem pretty committed at least for 2019, to churning out full frame lenses and k mount bodies.
Yes, Canon AF lenses were designed with built-in motors. This was done with the emergence of AF bodies, with new AF lenses for these bodies representing a complete change of systems. But their earlier MF lenses, which have no motor, are not at all compatible with Canon AF film or digital SLR bodies. Perhaps since, some kind of adaptor has come along to accommodate these older lenses. I've not kept track.