It depends on what you’re looking for. My roommate has a 4k laptop and the screen is so incredibly clear. However, he also has a super small laptop and does a lot of stuff where he needs really crisp graphics. I personally don’t see a need for 4k with my own devices. However, if you find a good deal and want to have it, then it’s worth it for you.
Basically, 4k is good, but not great enough to shell out more money. But, if you want it, then you do you.