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waifu2x still much nicer for art of course (comparison: https://i.imgur.com/4QkIUOc.png 2x, https://i.imgur.com/pQDuIpl.png 4x)

but for the stated purpose this looks pretty good. for example, 720p [https://giant.gfycat.com/AccomplishedBelatedBlueshark.webm] to 1440p [https://giant.gfycat.com/FluidBlissfulCob.webm] test. is subtle, improves video, and runs fine (tested via mpv, https://mpv.io/manual/master/#options-glsl-shaders).

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What's GT? It performs the best in your examples.

Anime4k looks obviously like a filter (I think Photoshop has an effect that looks like that, but I can't remember the name at the moment), particular at the 4x setting.

GT = Ground Truth, it's the original image used for the comparison (before being scaled down and then to scaled up with the different algorithms)

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