Technically yes, especially if you have a very large screen or sit very close. But the effect will always be very subtle. It's a diminishing returns problem.

There is also the content problem. 8k content exists, but it's very rare.

(P.S. Just my opinion, but the thing that makes people go "wow" with existing 4k TVs is not mostly the 4k part, it's improvements to things like High Dynamic Range (HDR) and Wide Color Gamut, the quality of which varies significantly by 4k set. I'm personally a bit cynical of 8k because of the price premium).