One you may have, just to see if there is a diff in something more static is The Batman - the opening Titles in red: WB, The Batman etc.
The bt.709 is a bit brighter (a shade more towards orange in presentation),
The bt.2020 is darker in comparison for me.
FYI, need to let it play as will not change when paused, but can do from a ssh session quickly flipping between the Y and N.