Season 4 and on were shot in Arriraw at 3.2k, and finished with 4K DI's, while VFX shots were rendered in 2K. That plus HDR and the fact that it's 10-bit makes for a sizeable improvement.
Game of Thrones: The Complete Collection 4K Blu-ray comes close to perfection with top scores all around making it one of the best Blu-ray's ever Summers span decades. Winters can last a lifetime.

All eight seasons of Game of Thrones are getting an upgrade at HBO Max. Warner Bros. announced that next month, the streamer will release the show in 4K Ultra HD, HDR 10, Dolby Vision, and Dolby

Someone said that it in fact never aired in 4k. So the disc is the only version as of that post that was in 4k. That is okay. Didnt really buy it for the digital anyway. Bought it for the disc. If I want digital, I would have just watched it on my HBO max sub. Thanks for messaging and trying to help.
Game Of Thrones 4K/UHD Screencaps. Couldn’t resist capping Game Of Thrones season 4 in 4K/UHD (3840×2160) when I saw it, especially when a friend asked me if I was going to It’s my understanding that only seasons 4-8 are true 4K/UHD, and seasons 1-3 have been upscaled from 1080p to 4K/UHD. I’d like to cap those early seasons in 4K/UHD

Game of Thrones improves on its already impressive Blu-Ray presentations with a stunning 4K UHD Blu-Ray upgrade in 1.78:1. The series is one that benefits more and more from the format as it progresses from season to season.

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is game of thrones in 4k