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.
FLCL is probably my overall favorite and I think this scene demonstrates a lot of its different styles with more silly and serious cuts. For just the best of the character animation, I think this scene is one of the best.
5 Centimeters Per Second is also one of my favorites and definitely my favorite of Shinkai Makoto's stuff. People talk about visuals where "you could pause it on any frame and have a beautiful image" and I think that's really true of this one. The honestly excessive use of really complex lighting gives it a really nice and unique vibe. The "ray racing on" of anime.
Kizumonogatari uses 2D animation on top of 3D backgrounds. Feels very unique, and on top of that, it's just really tryhard good animation. Each of the three movies have their own strengths, too. 1 is the most aesthetically consistent, with the artstyle giving off a really specific and deliberate vibe. 2 is overall the best looking and includes the most diverse character animations. 3 has its iconic final fight and mixes up the artstyle for a really climactic moment.
The iDOLM@STER Movie: Kagayaki no Mukougawa e! has amazing quantity and quality of character animation, but the emphasis is honestly on quantity. Skip to any random scene in the movie (even outside of the performances)and chances are there's an average of 4 moving characters on screen at any time. Really impressive, I kinda had my jaw dropped every time they do a wide cut of 20 characters, especially during the performances.
Quick bonus round: Kanon for the unique wintery aesthetic, Gunbuster for strong imagery, Evangelion also for strong imagery, Kareshi Kanojo no Jijou for expressive animation, Omoide Poroporo for great style, Welcome to the NHK! for color design, You're Under Arrest for great action cuts, The Melancholy of Haruhi Suzumiya for being overall beautiful in so many ways, Nichijou & CITY for style and animation, Soul Eater for the fight scenes, and I could maybe go on all day 😢 there's so much good visuals in anime
edited to include more animation links