I've got BlueCurve with an XG1-v4a 4K HDR box. The Shaw 4K HDR sports channels show colours that seem a little "hot" unlike Netflix' Squid Game, also in 4K HDR, which looks normal. Standard HD broadcasts, including sports, have excellent colour.
To me, an experienced photog, it looks like the saturation is too high. Not much, but noticeable. Players' faces look too red; uniform colours (especially red elements) are way too strong.
I noticed this on 4K HDR baseball and hockey broadcasts from Toronto and baseball from Los Angeles.
The TV set is a recent Sony Bravia with colour settings at "Standard", which results in excellent colour on HD broadcasts.