Yes, the Lexar Professional 1667x 64GB SD works with the Sony A7C II — with conditions (see below).
Lexar Professional 1667x 64GB SD is V60 class. Meets the floor for: 4K30 (30 MB/s floor); 4K60 (60 MB/s floor). (Peak write 120 MB/s is not evidence of sustained performance; the V60 class rating above decides this.)
Conditions for compatibility
Compatible with XAVC HS 4K (V30 required — card is V60, passes). Incompatible with XAVC S-I 4K (V90 required — card is V60). Recommended for XAVC HS users; not for intra-frame shooting.
“Sony A7C II Help Guide: XAVC HS 4K at 200Mbps requires SDHC/SDXC U3 or higher; XAVC S-I 4K at 600Mbps requires SDXC V90 — V60 card supports standard 4K formats but not intra-frame 4K.”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)