This is the key question, I get the extra cost due to being cinema release, but if they are then quality impacted that would be disappointing. Should be extra high quality.....Is the bitrate diminished, ala netflix or youtube or amazon prime?
(The amazon ones are available at an inflated price too, in this case 20 dollars.)
And many VOD services (Apple for sure, can not say about netflix or amzn) use variable bitrate technology. So even if they have a UHD copy, if network congestion does not allow for it, lower quality encode will be automatically used. And the other way around - if network allows, bitrate will be increased also automatically.Well, that's always the hope of the video compressionist, isn't it? But hopes are one thing and bandwidth limitations are another.