Photons to Photos added the Fujifilm X-Pro3 to their database. As a result you can now compare the dynamic range and low-light performance to all other cameras in their database.
So with having the same processor and sensor, does the X-Pro3 has better dynamic range?
Bill Claff from PTP said on DPR Forums
“The X-Pro3 appears to have improved PDR but it is an illusion.
It’s well known that Fuji implements the ISO setting in an unusual way.
In this case they have given ISO 320 to ISO 12800 an addition 1 stop boost.
Fuji uses a proprietary Exif tag called “Raw Exposure Bias” to indicate how much they have shifted the raw data from “standard”.
Adjusted in Excel for Raw Exposure Bias we see that the X-Pro3 and X-T3 are essentially identical. (They shift to dual conversion gain at a slightly different point).”
Read more Fujifilm Rumors.
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