I hankered after one for ages and hired one from FujiFilm for 2 days FOC.
It is gorgeous but in the end I decided to stick with the lovely 10-24mm for the following reasons:
I like using filters and the unique design of the lens means a Lee (other adapters are available) which is big on an already big lens and adds £2-300 onto what is an already expensive bit of glass.
Its extra 2mm width over the 10-24mm doesn't seem to be much but it really is and requires a bit of thought on composure and positioning. It obviously lacks the reach from 16mm.
I was concious of the bulbous lens which is protected to a degree by the lens hood but was scared that I would damage it and forfeit my deposit. It is a lens to remove cap, shoot and replace cap pronto.
IQ wise at 8mm it is unbelievable, rectingular and no curvature/distortion at all. Ideal for interior shots but I then asked myself how many interior shots I did and the answer was not many and not £1400-1700's worth.
The 10-24mm, mine is the pre WR one and is an excellent copy, does everything I need.
But it is a work of art, built like a brick s**t house and just gorgeous.
I put the rapid-fire Visa card back in my wifes purse, breathed a sigh of relief/disappointment and started looking in earnest at an X-H2s with the money I (hic) saved.
Andy Mumford and Andria Livieri did some fab reviews and I thought Andria's was fantastic and just about covered what I experienced apart from he was in Venice and I was in a heatwave in Mid Wales, ie p***ing down.
View: https://www.youtube.com/watch?v=drAb7rshKRM