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HDR10 is the only mainstream and widely adopted standard for HDR, although Netflix also support the technically superior Dolby Vision (HDR+ won't go anywhere). My understanding is that the issue with Sky is of a technical nature being able to encode live broadcast content. Besides, most mainstream TVs now support multiple HDR standards anyway. Sky are seriously lagging behind other content providers in lacking HDR support which is arguably more important than 4K alone.I believe the issues is there are multiple standards of HDR and Sky have always been wary of adopting the wrong standard so they usually sit back and wait. I've heard it'll be a year or so before HDR on Q and yes, HDR and Atmos won't work through the Q box with Netflix either.