No, it's really not. I can see it for stills, absolutely. But for animation, unless you're in the VFX industry for big budget movies like the Marvel movies it's just a waste of money.
I forgot where I saw that, but you need either a really big TV or be pretty close to the screen to even have a noticeable difference between 4k and 1080p.
For me the ideal resolution right now is 2560x1440. It's the perfect middleground between FHD and 4k. It looks great, is noticeably sharper and not a waste of resources.