I've had both the Mamiya/SK 75-150mmm and SK 75-150mm F4-5.6 AF LS
It turned out I brought the no-LS lens with me most of the time due to weight.
This picture was taken with the old Mamiya 75-150mm (non LS). I am not a professional, but with my eyes, the non-LS lens produces great IQ although I've never compared side-by-side between both of them. I have something else to do with my life
From what I've heard, Phase One's just changed the outlook of the lenses (make it heavier and heavier) but not lens design.
Again, from what I've heard, the BR with new lens designs are only the 35mm, 45mm. The 150mm f/2.8 is debatable.
Phase One, hear me, make the lenses lighter for landscape photographers. Hasselblad can do it, you can do it !!! I think you are on the wrong path for landscape photography.
I'm getting older. One day I may have to do the same as other fellow landscape photographers do, sell the XF system!