2 earlier NFS articles state that it does but I havent heard anyone else talk about it or confirm it...
"This might have flown under the radar, but the EOS R5 can record a 12-bit 8K RAW signal and simultaneously record a 4K MP4 file at the same time. What Canon has done here is create a nice proxy option to allow editors to quickly start editing the 4K files as most modern computers can handle 4K workflows. The RAW video file will record to the CFexpress card, and the SD card slot will record the 4K file. "
"The EOS R5 can also simultaneously shoot a 4K MP4 file while shooting 8K RAW. The 8K RAW signal would go to the CFexpress card, the 4K DCI would record to the SD card. "
Gonna get some beautiful footage with that $150 lens too!
Great tips. I Also like tucking it into the knot of a tie for corporate interviews.