Not sure of if there exists a dynamic range chart for the XF605. In terms of base ISO, perhaps page 189 of the User Manual may shed some light.
There it mentions that "values may differ depending on the gamma settings" with the following callouts:
For the second and third points above, the reason for the two values appears to be driven by if you have ISO/gain set to increment in full stops (first value) or 1/3 stops (second value).
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM