This is a collection of raw file samples for all Fujifilm cameras I have owned. All photos are shot by me and are free to download and use (Creative Commons). I recommend using Capture One to get the most out of Fujifilm raw files. I will try to keep this updated when I test out more cameras in the future.
There are even more raw files you can download on my blog. I.e. I have a large collection of raw files for the Fujifilm GFX 50S II here, or for the Kodak 645 Pro Back here, or do a search on my blog for all pages with raw files here.