Movies from AppleTV look terrible on iPhone 12, why? anyone else?

[iMore Question]

Even 4K movies that are fully downloaded, not streamed, look like a grainy mess. They look like 320p. Unwatchable. Anyone know if there is a fix for this?

 

[Just_Me_D]

Movies look amazing to me on my iPhone 12 Pro.

 

[Ledsteplin]

Movies look fine on my 12 Pro Max.

 

[Annie_M]

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