Are they really game changers though? Baraka (1992) in 1080p non-HDR looks stunning.

I remember being quite blown away by my first Blu-ray discs (Planet Earth series) on a PS3 connected to a 1080p plasma, well ahead of ubiquitous 4K and HDR. It was the first time source quality really made a difference to me, coming from DVDs and rips.

HDR truly is. It's as big a leap as the jump from 480 to 1080 IMO.