The lens you are talking about is the Leica S Apo-Macro Summarit 120mm? This is indeed one of the best lenses I have ever used, both for macro and portrait or general landscape.
Pity, this will not work with Hasselblad X1D, because of lack of adapters and the electronic contacts for aperture.
I would recommend the Leica R Apo-Macro-Elmarit 100mm - f/2.8, which is easily available on the used market. One of the best macro lenses out there. The nice thing is that it covers enough image circle for the X1D diameter. I have it and use it with my Leica SL, but will try it also with my X1D. At the moment, I still don't have the adapter, but I was told, Novoflex and Kipon are working on an Leica R-X1D Adapter. You could already stack 2 Adapters: 1) Leica R to Leica M and 2) Leica M to X1D (Kipon), but I didn't try that.
The Leica R Apo-Macro also has the right compact form-factor for the X1D. It is fully manual, which I prefer for macro, but goes up to 1:2 only. For more (1:1) you would need to buy the additional Leica Elpro.
The Zeiss Makro Planar 100mm (f/2.0) could also be adapted. It is an excellent lens, but I have seen on some forums, that it vignettes a little bit on the Fuji GFX. also only 1:2.