Hi,
I would not suggest that any older generation MF lens would be a fair match for the Otus at 44x33 mm. If you design a lens that is sharp at large apertures it will outshine lenses that are doing well at smaller apertures.
On the other hand, all lenses run into the diffraction limit when stopped down beyond their optimum aperture. The Otus peaks around f/4, that actually means it is twice as sharp as a lens that needs to be stopped down to f/8.
My actual experience is limited to bunch of Zeiss lenses for the Hasselblad, 40/4CF, 50/4CF, 60/3.5CF, 80/2.8 CFE, 100/3.5 CF, 120/4CF, 120/4 CFi, 150/4 CB, 150/4CF and 180/4 CFi.
Of those I would regard the Planar 100/3.5CF, the Sonnars 150/4 and the Sonnar 180/4CFi to be very good. Compared to the other lenses I feel that my zoom lenses used on the Sony A7rII are superior. I have used the Hasselblad lenses with P45+ back, mostly.
The best performers would give very good performance over 36x48 mm at 80MP, the weaker performers would be quite OK, but not great.
I did not do a lot of comparisons between Sony A7rII and the P45+, but some cases:
- Planar 100/3.5 on the P45+ vs Sony 90/2.8G on the A7rII, Sony wins easily
- Planar 100/3.5 on the P45+ vs Canon 24-105/4L on the A7rII, about even
- Distagon 40/4 on the P45+ vs Canon 16-35/4L on the A7rII. The Sony plays in a different league, higher one.
Jim Kasson has tested a lot of lenses on his GFX. What he has found was that the Fuji GFX lenses were essentially Otus class. That said, the Otuses performed very well on the GFX, but they would not cover the whole field.
Jim has found that his HC lenses were not up to the class. Regarding the Zeiss lenses he found that the 250/4 Superachromat was a good performer, but it was not very practical. So, he sold all his HC and V-lenses.
I would suggest that both Hasselblad and Fuji make great lenses for their 44x33 mm camera systems. I would be 100% sure that the new GFX lenses widely outperform older lenses designed for 6x6, especially if axial chroma is taken into account. Some exceptions may exist, however.
Best regards
Erik
Also, MF lenses seem to be optimized for sharpness whereas the top 35mm primes are optimized for large apertures (e..g otus )