Hoi - it depends on the resolution in which you watch (or have) the videos or series. But in general: Yes.
At 1080p on a 4k resolution "it still doesn't look bad", at 720p you'll see more "artefacts" and blurriness, less detail, anything below that you'll see that it's just blurry to more pixelated... and 4K content can also look "unnatural" or exaggerated... It's subjective, a matter of opinion, depends on the content...
I use 3 screens on my Mac for example - 1 time 4K with full resolution - 1 time FullHD 1080 (but can do 4k, switch resolution there), 1 time WQHD (2560x1440) When I watch a video in YT for example. I watch a video in YT on the 4K monitor (then also has the 4K as resolution) and the video in YT is 4K, then I see e.g. the hairs on the jumper, with 1080 then you "see it" when you look at it or it seems blurrier...
For films, videos and "just for consumption", 1080 is fine, 720 is also fine, just with "even" less "sharpness", everything below that is just...well.
Hope that helps.
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