For the first time a mirrorless camera achieves not only 8K but 8K in its full RAW glory. For comparison the 5.9K Canon 1 D X Mark III files cannot be played in realtime / full resolution with the 18 core iMac Pro. 8K will therefor be that much harder to crunch. There is hope though; a week before the R5 launch, Blackmagic released Resolve update 16.2.3 with full Apple Metal support providing a performance boast that will be tested once R5 RAW footage hits the internet.
But do we need 8K? Yes we do!
4K files viewed on a 4K monitor look better when the original footage is shot in 8K. This is due to the nature of the Bayer Filter process and result of supersampling. Both of which are topics worth researching. In essence a larger resolution video packed down to a lower resolution screen will show less noise and more color fidelity.