Camerasize just added the Fujifilm GFX100 to their comparison tool and the Fujiflim dwarfs the Nikon D850 in size. Similarly, the Nikon D850 weighs in at 2.01 lb, while the GFX100 comes in at 3.08 lb. You can view the above comparison here.
The Fujifilm GFX100 is definitely more in the Nikon D5/Canon EOS-1D X Mark II territory when it comes to size and weight, but here the GFX100 has the advantage. The Nikon D5 comes in at 3.11 lb and the Canon 1D X Mark II comes in at 3.37 lb, which are both beyond the Fujifilm GFX100 at 3.08 lb You can compare them for yourself here.
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Fujifilm GFX100 (Preoders): B&H Photo / Amazon / Adorama
Fujifilm GFX50R: B&H Photo / Amazon / Adorama
Fujifilm GFX 50S: B&H Photo / Amazon / Adorama