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Machiavellian said:

Thanks for the insight on HLG.  For some reason I thought it was the new format for HDR 10 that suppose to have the dynamic metadata that is lacking in the format that Dolby Vision has which allows it to adjust the brightness level per frame.  I believe the dynamic metadata is the big win for Dolby Vision at the moment as it does give the extra pop when transitioning from day to night scenes.

While it does have that, I doubt you can actually notice the difference in today's content.

http://www.rtings.com/tv/learn/hdr10-vs-dolby-vision
These guys couldn't and they declare DV the winner based on specifications. It is however more relevant to OLEDs lower peak brightness as DV supports standard tone mapping, ie adjusting the values that fall outside the capabilities of the tv while with HDR it's left up to the tv manufacturer what happens with values that the tv can't reach.

Dolby Vision is more future proof, yet no existing panel can actually display the difference, nor the full capabilities of HDR10 for that matter.

Actually these guys saw a difference
https://www.whathifi.com/features/hdr10-vs-dolby-vision-which-better
Out of a sample size of 2, Despicable me 2 looked much better in HDR10, Power rangers looked clearly better in Dolby Vision.
I guess it all depends on the mastering process.

Here is a very in depth comparison which I can't be bothered to fully watch lol

https://www.youtube.com/watch?v=voePq29-U6M

I did briefly skip to 25 minutes in where he's comparing one scene. DV better tone mapping, HDR10 better shadow detail. DV more black crush basically which is kinda unexpected. Anyway as a 1080p you tube video on my crappy LCD Laptop I can only see the black crush difference and higher contrast on the left. Yet when it takes putting two tvs next to each other to play spot the small differences, it's simply more of a disruption (mastering for 2 HDR formats) than a benefit. At least this format war is way less disruptive than hd-dvd vs blu-ray.