Yes, the Canon EOS R5 Mark II works with the Sony Tough G 128GB CFexpress Type B — with conditions (see below).
Canon EOS R5 Mark II's Slot 1 accepts CFexpress Type B cards directly. Sony Tough G 128GB CFexpress Type B's VPG certification could not be confirmed -- Sony's own spec page 403s, and independent research indicates only the larger CEB-G960T/CEB-G1920T variants are VPG400-certified, not this 128GB card. Canon's own spec requires VPG400 for the camera's RAW/Intra-codec modes (including its top 8K RAW tier), and peak write of 1480 MB/s is not evidence this card meets any of the camera's sustained-write floors (30/60/90 MB/s for 4K30/60/120, or the higher RAW/Intra tiers) -- verify this card's real sustained write speed or VPG rating before relying on it for any recording mode on this body.
Conditions for compatibility
Fits Slot 1 (CFexpress Type B). Sony Tough G 128GB's VPG rating is not confirmed in the DB -- verify VPG400 before relying on it for any recording mode on this body (Canon requires VPG400 for RAW/Intra-codec modes, including its top 8K RAW tier).
“RAW Standard RAW 29.97 CFexpress 2.0 Type-B [400MB/sec. or faster]”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)