I mostly dislike sharp portraits. I have owned 85 Fujki SF screw mt, RB76 150, 300 mm Imagon for 4x5+,
and 120mm Imagon . I can tell you there is nothing you can hang on the front of a lens that does what a true SF lens does. Tried everything one time or another. Softars come closest.
The 120 is T Mount and it came for Leica R. It is now Nikon F and the only one I still own.
If you work with photoshop, you can get close to some of the effects.