Yes I have to say that my OLED is not the best watching during the day time. It is certainly much more pleasing during the night.I loved the HDR on The Morning Show and some beautiful sun effects in Red Dead Redemption 2 ... in general I’m really pleased by Apple TV’s quality 4k/HDR ...
Sometimes the effect is more subtle, like just the absence of not having the ugly artifacts in low lit scenes and then one or two lamps that really stand out. This effect should be even better on OLED.
The actual max brightness on something like the Samsung QLED is much higher though so I suppose the effect sometimes really stands out more there. More so when you are watching during the daytime.
I switch between HDR and SDR in PS4's Spider Man (just checked the intro havent really played it) and the difference isnt strongly pronounced, top the point that I wonder if it is either a placebo or a deliberate reduction in saturation in SDR to make the HDR seem more convincing.
My non HDR TV when set to its' highest saturation pops the colors so much that it makes me wonder if the difference between HDR TVs and non HDR TVs is really that big