5 - Revue Starlight Movie - Sakugabooru
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OP’s comment: Too bad their SFX is ass.
4 - Demon Slayer Entertainment District Arc - Sakugabooru
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OP's comment: No one does 3D graphics better in anime than Ufotable and KyoAni to an extent. If you want to find better 3D animation, you have to go west and look for the likes of Disney/Pixar.
3 - Violet Evergarden - Sakugabooru
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2 - Akebi's Sailor Uniform - Sakugabooru
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OP's comment: Violet has the higher highs, but Akebi has better and more consistent average quality
1 - Tsurune S2 - Sakugabooru
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Honorable mentions:
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Demon Slayer Infinity Castle - Haven't seen it, but it seems to improve on the Entertainment District Arc based on the trailer
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The Fragrant Flower Blooms With Dignity - It's not in my top five simply because I haven't finished it yet. But as it stands, at its best, it would be at #3 or #2. I mean, look at this. It (and the recent Episode 12 post) inspired me to make this post. It will come down to how consistent its animation quality would be.
I don't have a one-fits-all pick for visuals so I'll break it down into different sub-categories. (I also get to cheat this way and pick several)
Line art: Violet Evergarden
Composition: Hyouka
Cinematography: Wonder Egg Priority (early on at least)
Artistic style: Keep Your Hands Off Eizouken!
Atmosphere: Haibane Renmei
Choreography: Cowboy Bebop: Heaven's Door
Compositing (not to be confused with "composition" above): Sound! Euphonium
Background art: Grimgar of Fantasy and Ash (RIP Hidetoshi Kaneko)
Character animation: K-On!
ps.: OP gets an updood for Akebi's Sailor Uniform. It's one of my 10/10 and is criminally underrated.