I just downloaded the "comparison clips". Who is the videographer?PatR, I haven't found very much H.265 H Plus source footage so my observations are based on H.264. There are a few useful C23 comparison clips here but I don't see much difference in quality or playability between the H.264 and H.265 files except that the latter benefit from a slightly warmer colour palette.
For the avoidance of doubt, I have seen some very high quality H Plus 4k footage - just not at 60fps. And in a flat light with ultra-slow camera movements I have also seen a very clean 4k/50fps video (German village) - albeit with stuttering pans.
For whatever reason, the H Plus seems to struggle with higher frame rates while the EVO handles them better, imho. The EVO system also seems to cope better with camera movement which is faster than dead slow.
Incidentally, I looked at the 1080p and 720p 120fps examples at the link above and found them unwatchable. Does anyone else on a different computer think they are of acceptable quality?
I certainly agree that the 120fps clips are awful. However, the the fast pans in the 60fps clips all played buttery smooth on my rig regardless of coding. The 30fps clips had the understandable jerkiness of too much travel between frames. I ran the videos with Windows Media Player, "Movies and TV", and VLC players in Windows 10. Same.
FWIW, my computer has an Intel i7 processor and an nVidia GTX 1070 video card.