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.
Nichijou, City, Lucky Star, Hidamari Sketch, Zetsubou sensei.
Nichijou and City have this very special thing where the foreground (mostly characters) and the background have this seamless harmony. Usually the characters are in a completely different art style and colour palette than the background.
Lucky Star's backgrounds are in that delicious water colour style. Hidamari and Zetsubou each have an iconic flat style that just has so much soul to it.
All my picks have an unrealistic style and most of them are very chibi. Much more can be said about their style but I'll keep it short, you'll just have to watch them :)
Another zetsubou sensei enjoyer, nice.
It is one of my favorite anime and manga series, Top 5 for me. The soundtrack is also a banger.