Yes, the Canon EOS R5 Mark II is compatible with the Sony Tough G 128GB CFexpress Type B.
Sony Tough G CFexpress Type B writes at 1480 MB/s, far exceeding Canon R5 Mark II's highest standard 4K requirement of 90 MB/s (Video Speed Class V90) for 4K120. Physical form factor is Type B matching the R5 Mark II's primary slot.
“Canon EOS R5 Mark II Compatible Cards: CFexpress Type-B compatible; cards for movie recording should support VPG400 per Canon online manual.”
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