I have both, slightly by accident, and seem to have ended up keeping both for different reasons. The f2 is great and has obvious advantages, being lighter, smaller, faster (and more silent) to focus, and weather resistant. Optically it’s fine, although a little soft close up at f2.
I still really like the 1.4 though and in certain situations it’s worth the extra weight etc. Sharper close up, less clinical, and of course a whole extra stop of light. Certainly indoors it’s my go to.
One thing about the 1.4 though - when I was first using it on my X-Pro3 I was seeing a lot of misfocus, where I’d have a green box and it would claim to be focussed but the resulting image was a little off - this was always in well lit situations where the PDAF would definitely have been active. For a while I thought I had one of the “bad” copies people talk about. Then I switched back to an X-Pro2 and suddenly it was focussing perfectly every time, and I’ve since had no problem with it. I don’t know whether that’s just the XP3 or all the later 26mp+ bodies, but there definitely seems to be some incompatibility there, presumably fixable in firmware if Fuji ever get around to it.