I've owned/used the following lenses on the X-Pro 1, X-Pro 2, & X-T1:
10-24mm
14mm (SOLD)
16mm
18mm (SOLD)
23mm
35mm
56mm
50-140mm
55-200mm
Other than the 14 and 18mms, I've kept most everything I've acquired in my Fuji kit...and honestly, the only reason the 14 and 18s got the boot were because the 10-24mm overlapped their focal lengths, and once I acquired the 16mm for my high speed wide needs, the 14 & 18mm started to feel a little "pointless." I will admit the 18mm was the WEAKEST of the entire bunch of lenses listed above optically IMO.
Of the bunch, the one that I have always felt a special connection to was the 35mm 1.4. It's ALWAYS in my bag, and has never let me down. Optically, it's simply an amazing, "never bad" lens under every shooting situation I've thrown at it. The bokeh, sharpness, and microcontrast are simply incredible on my copy. I don't think I've EVER used a 50mm (or equiv) lens as good for the price. Yes, my 50 Lux ASPH is still better. But the Fuji 35 is like 1/5 the cost whilst being 95% as good, plus the Fuji also manages flare better, has autofocus, and hasn't needed nearly the amount of upkeep the Leica requires. And the 35mm for damn sure beat the Canon 50L that I don't own anymore; the 35 is truly an impressive piece of glass, especially considering it AND my X-Pro 2 weigh about as much as the 50L does on it's own!
Other standouts for me include the 23mm and 16mm, both are nice and sharp, and offer a nice 3D "pop" to them that I find pleasing. Both the 16mm and 23mm go from usably sharp wide open to SHARP between f/5.6 and f/11. My preferred range for both are f/2-f/4. I don't think that it's coincidental I use them and the 35mm most often. Another big selling point for the 16 and 23 are the ergonomics, I just LOVE the pull to focus ring with distance scales.