WestWorld Season 1 is coming out on 4K Blu-ray. There’s a season 2 of the show coming out. I also imagine many of their shows are shot in 4K but are released at 1080p. And they’re also rapidly producing more content that could be released in 4K. I’m honestly confused about your question.
Westworld was filmed on 35mm and delivered in 2K JPEG format to HBO. The 4K bluray version will likely be the same 2K upconvert from the copy that was delivered to HBO.
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What the hell does 'finished' mean? I guarantee you don't even know what you mean when you type that. The studio has all of the original captured scenes in their native resolution. That's why you get 'never-before-seen' bonus BS all the time on future releases because they intentionally hold BS back. They have everything.
I think they mean is was mastered and color graded for theatrical and Home release. The studio (hopefully) keeps their archives in pristine condition so that the original negatives (doesn’t apply to digital unfortunately) can be resurrected should they feel like spending the time and money.