As per my findings of the damaging focus shift problems with the Fujifilm 120mm f/4, I have a new Fujifilm GFX and new 120mm f/4 showing up tomorrow.
I may have just enough time to confirm (or not) my findings with the first camera and lens as documented extensively in my review. Or I may have to do so in the field. Either way, I will have an answer relatively soon as to whether the atrocious behavior occurs with an all-new GFX+120/4.
UPDATE 28 March: I have reproduced the horrific focus stability problems with a brand new 120mm f/4 and a brand new GFX. This disproves any “bad sample” theory. I suspect an electronic glitch bug between camera and lens, though its impossible to say.
I will be taking the GFX plus 120/4, 63/2.8 and 32-64/4 zoom with me on my trip to the Eastern Sierra, shooting after I ride the Southern Inyo Double Century.