The crop factor compared to the 35 mm format as a reference is 0.79.

Ratio of the reference frame's diagonal (35 mm format) to the diagonal of the image sensor in question (Fujifilm GFX):
The crop factor compared to the 35 mm format as a reference is 0.79.
Ratio of the reference frame's diagonal (35 mm format) to the diagonal of the image sensor in question (Fujifilm GFX):
Fujifilm G-mount