Originally posted by grantsarichev my desire is to find out if Pentax takes a step for medium format to go beyond studio (like gfx 100 for example)
So, with respect to this question and the former one you asked me, I think the most truthful answer is: no one knows.
Jim Kasson has done extensive testing with the Fuji lenses (and lots of others on other cameras) and deems them somewhat future proof with respect to the Fuji system today and its likely next evolution. But again, Fuji has committed in its current lenses to the cropped 645 sensor size. That's not to say they won't change their minds in the future---they are a big enough company to do that---but you'll need new lenses, which = more $$$ or €€€ or £££ or ¥¥¥ or take your pick
We have no
quantitative idea about the Pentax lenses because only Pentax has tested them (to give us what mtf charts we have). No independent quantitative testing has been done on these lenses at all by anyone.* What we do know definitively is that for all but one the lenses' image circles would cover a full size 645 sensor.
With respect to the comment above about pixel shift (which also brings with it composition adjustment!) and IBIS and the extra space inside the Z...I think a bunch of that extra space is there so that the camera is
backward compatible with all the old lenses w/o and adapter.
For the Fuji 100, the 16bit file is a good thing, obviously, and IBIS is very much a good thing.
But if I were buying again today, I would make the same decision I did in 2014, Pentax 645Z.
* we have plenty of trustworthy positive qualitative evaluations of these lenses, and my experience is that they are very fair; and that most of these lenses are great, and will easily accommodate a move to a larger sensor in both size and mp. The standouts are the DFA 28-45, the A or DFA 35, the FA 45-80, the DFA 55, the FA 75 (and the rare LS 75, along with the rare LS 135), the DFA 90, both of the 120's, and the FA 150. Also very good are the FA 80-160, the FA 200, the 300's, and the FA 150-300 (one bad review here pulled its score down, all the rest of us think its great). A couple of the other lenses have recently found renewed love and are being re-evaluated.