Canon Romorsの情報が正しければEOS R5すごいですね。
8K RAW internal video recording up to 29.97 fps
8K internal video recording up to 29.97 fps in 4:2:2 10-bit Canon Log (H.265)/4:2:2 10-bit HDR PQ (H.265).
No crop 8K and 4K video capture using the full-width of the sensor.