The latest sensor technology is extremely impressive!
Consider that the 4.3 micron pixels of the Nikon Z7 are 30% larger in area than the 3.76 micron pixels of the GFX100. And yet the noise performance of the Fujifilm GFX100 sensor cannot fail to impress. It bodes well for the Sony A7R IV.
Includes images up to full sensor resolution from ISO 100 to ISO 12800, plus crops and some 50MP equivalents.
Below (cropped slightly), ISO 1600. This performance makes a compelling case that the Fujifilm GFX100 is the superior camera for the Fujifilm 50-megapixel offerings even if one only wants a final 50MP image—downsample and be very happy!