I heard very good things about the 7Artisans M-mount to Fujifilm X-mount adapter and how it worked perfectly with some tricky Leica glass like the Summicron Dual Range 50mm f2. Now, 7Artisans is releasing a similar adapter for Fujifilm GFX that should be available on Amazon soon. This adapter will work with 7Artisans’ new M-Mount glass which you can also find on Amazon.
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Fujifilm GFX100: B&H Photo / Amazon / Adorama
Fujifilm GFX50R: B&H Photo / Amazon / Adorama
Fujifilm GFX 50S: B&H Photo / Amazon / Adorama