If APS-c suits your photography this is a great 1500£ snapshot lens. Everything folks are saying regarding the OOF rendering at F1.0 would appear to be true, it is sublime. The lens is significantly larger, heavier and will not go unnoticed. Quite the looker.
If you shoot portraits or any content that benefits from more depth of field (sufficient so the entire face is in focus) and you will more often than not be closing down a bit to f2.8 or f4, the XF 56mm f1.2 has a bit more length - 85 equiv vs, 77- and you save 500£. f1.2 is still quite shallow for those types of shots and unless you have identical images side by side the differences in that OOF area will likely go unnoticed- besides- if your subject is fab your audience won't be dwelling on the background.