I use Pentax Z-1p (Zx-1P) and manual focus MZ-M.
Well, why Pentax? There were several reasons and considerations for this. I like the built quality and functionality of the Pentax gear.
Despite it lacks the gimmicks like eye control or ultrasonic focusing motor, introduced by its competitors, and has only one central AF sensor, Z-1p is a very well specified camera and has everything that one may ever need. Not considering a couple of minor drawbacks, I'd say it's a pro body. But if you are a sports or action photographer, this one maybe not for your...
There is a wide choice of K-mount accessories available on the market, both new and used, from Pentax and independent manufacturers (like Ricoh, Vivitar, Soligor, Panagor etc.). The strong side of Pentax is the lens mount. It is mechanically identical for both AF and MF cameras. This ensures the compatibility between all the Pentax products and give you the excellent chance of using even  20-year old  lenses or accessories on the modern AF cameras or wise versa. Pentax never changed the lens mount so dramatically as some competitors did while switching to AF (shame on them!). You can even use the old M42 thread lenses on Pentax K-mount bodies by means of a simple and cheap adapter.
The flat front plate of MZ-M allows you to "big" old lenses (i.e. of mirror-reflex type), what can't be done with the most of modern cameras. So I do with my F5.6/500 and F4.5/300 Russian lenses.