This footage looks OK, but judging by, say, the fire footage at 0:25, where the color of the flames looks harsh and digital, it's obvious that the R5 is really not a filmmaking camera --- at least in 8K-mode, where the bitrate is stretched across that many pixels.
I look forward to comparisons of ARRI Alexa classic and R5 footage, which should demonstrate that smaller resolution can = big results