After Firmware update version 1.3 for Panasonic Lumix S1 and S1R, now both cameras support CFexpress cards. Currently SanDisk Extreme PRO Type B CFexpress card now already in stock and shipping at Adorama.
Panasonic has officially announced new firmware version 1.3 for Lumix S1 and S1R full frame mirrorless cameras today. The S1 (B&H Photo Video/Adorama/Amazon) and S1R (B&H Photo Video/Adorama/Amazon) gain CFexpress compatibility, function better with Sigma L-mount lenses and adapters, along with a host of minor fixes and feature extensions. The new firmware version 1.3 will be available on November 19th, 2019.