It depends on your visual acuity and how far you are from the screen. But even under the best conditions, the difference is minimal.

I’ve long maintained that the value of 8K displays is not in the increased pixel count. There’s a limit to the resolution that humans can discern on video screens at normal seating distances, and increasing the pixel density beyond that limit offers no advantage.

But where, exactly, is that limit? More specifically, do 8K displays offer any benefit in terms of perceived detail compared with 4K under normal viewing conditions?
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https://www.techhive.com/article/3529913/8k-vs-4k-tvs-most-consumers-cannot-tell-the-difference.html