Why is the Fuji RAW file bigger than Sony and Olympus?

23970816 bytes of raw data (12bpc), if it were 14bpc the raw data alone would be 27965952 bytes.  65450 bytes of EXIF (seems to be a fixed size).  That leaves around 2110550 bytes unaccounted for.  That makes uncompressed very likely.

That's also supported by the easy 20-30% compression available on these files, vs <5% on an OM-D raw file of the same scene.

Plus dcraw uses unpacked_load_raw to handle RAFs, so that sort of settles it.  Reading the source would answer most of these questions definitively, if one has the time.

It displays a complete lack of understanding of the topic under discussion.  Always a great opportunity for some mindless copy/pasting though.