DRPreview TV reviewed the Fujinon XF 8-16mm f/2.8. Here are their findings:

• professional line of Fujinon lenses
• well-built, heavy and expensive
• well suited for cameras like Fujifilm X-H1
• manual focus ring feels sloppy
• no OIS, but it’s typical for lenses in this range. But they miss it anyway, unless used on X-H1 with IBIS
• XF 10-24 more well suited for lighter bodies and has OIS
• no filter threads, typical for lenses that wide
• powerful autofocus motors. Fast and accurate
• coma very well corrected, excellent for astrophotography and cityscape
• vignetting and distortion very well corrected
• sunstars are not bad, but not the best they have seen
• close focusing is similar to the XF10-24 (9 feet)
• XF8-16 optically fantastic, very sharp
• 8mm at f/2.8 a little bit weird in the corners, but stopping down cleans up beautifully
• wide open it is sharper than the XF10-24, but stopped down difference gets smaller
• It’s admirable that Fujifilm gives us lenses that give us full frame equivalent look, like the Sony 12-24mm f/4 G
• the Sony 12-24 is lighter and $300 cheaper
• if you want FF look in APS-C, you are not going to save money
• for most people, the XF 10-24mm F4 is a better choice, since landscape you stop down anyway
• XF 8-16mm F2.8 is a niche lens

Fujinon XF 8-16mm f/2.8 (save $100): BHphoto, Adorama, AmazonUS, Focuscamera
Fujinon XF 10-24mmF4 OIS (save $100): BHphoto, AmazonUS, Adorama, FocusCamera