So.. 2 brands ..
Pentax or Fuji bodies..
Hasselblad out of budget I guess?
thank you all for your useful replies
nice forum btw
Gaul
Looking at your gear list (if it's current) your main camera would seem to be a FF dSLR, and then you have a m43 MILC, and then a couple of 'compacts'.
The tide of the MILC reached medium-format many years ago, and now there is maybe only a couple of dSLR type medium-format cameras in production (someone can correct me if I'm wrong), the XF by Phase One and the S3 by Leica - both v.expensive.
If you want to buy into a current system it'll have to be a MILC. A second-hand Fuji GFX 50S or 50S II would be the way to go, with either the 45mm or the 35-70mm zoom to start, then acquire lenses as you wish.
The other route is a dSLR medium-format camera that is now out of production (along with lenses that are out of production).
Two options come to mind, 1. a Hasselblad H3DII-31, this would the cheapest way in as a body, has a 31MP CCD sensor - which is now rather outdated (keep ISO's low), second-hand lenses might be pricey but not too bad. 2. Pentax 645Z - which to me is the far better option, mirror action much softer and an all-round more modern camera, and 51MP (a CMOS sensor without PDAF that I prefer to the latest 102MP). Pentax 645Z lenses are quite affordable and nearly as good technically as current Fuji GFX lenses, though in fact in terms of rendering I prefer the Pentax glass.
So a question, how much do you prefer the OVF experience of your FF dSLR compared to the EVF experience of you m43 camera? The EVF of the GFX 50 will be better and larger (I have one), but it flickers, stutters and is contrasty, basically for me I prefer my 645Z, hands down.
One of the joys of photography for me is occasionally using manual focus. dSLR lenses have true mechanical manual focus, MILCs focus-by-wire - where you are manually adjusting the AF motor. I can't get on with focus-by-wire, so I use my GFX, AF only. My 645Z both ways, the lenses have true mechanical coupled manual focus, and are a joy. With your FF dSLR do you ever use manual focus?, with your m43 do you use focus-by-wire manual focus? - just questions worth considering.
If you like EVFs then the GFX 50S or 50S II would be the way to go - as it'll focus a bit more accurately and faster than the 645Z, and is a current system. To me the beautiful OVF of the 645Z along with the handling and build of the camera (including a tripod mount for portrait orientation shooting), still means it's my preferred option.
As to lenses, coming from FF - a 3:2 ratio, the medium-format 4:3 proportion is like your m43 camera. So while 45mm on MF will give you close to 35mm FF, all the 'equivalents' look tighter to me. So a MF 35mm wide angle, doesn't look as wide as a FF 28mm - which is what it's equivalent to - as some of the 'angle' is being spent more upwards rather then across. Hence I wouldn't rule out the amazing DFA 35mm, if you were to look at the 645Z.
Fuji doesn't have anything in a prime lens that has roughly the field of view of a 135mm lens on full frame. You need ~180mm for that. The GF 100-200 would give you that focal length at the long end, and it would give you roughly 80mm in full frame at the short end. If adapting works, you could adapt Pentax 645 lenses; the Pentax-A 150mm is inexpensive and very good closed down a stop or two. The Pentax-FA 200mm is also very good.
