Been trying to decide between these 2 lenses for my X-T5. For my Sony FF 61mp I been using the C/V 21mm f3.5 Color Skopar MF lens for 6 years and just love it, it seems to be wide enough for what I photograph. If I need wider, I use multi pano shots. But having a few mm wider and owing other Sigma lenses for Sony in the Comtemporary I metal series, and finding them excellent, made the decision tough.
For me it finally came down to less (raw) distortion for the Fuji, the full metal build at the same weight (235g), and I was able to buy an Excellent, made in Japan version with all accessories for only $279 at mpb with a full return warranty for 90 days. Hard to go wrong with the Fuji 14mm f2.8 at a 72% discount off the retail price