If you have the budget for it then definetly. The less visible pixels the better. Creates a better immersion to the game. Been playing on 4k for a few years now and im not able to stand playing on 1080p anymore. I do use a 3440x1440 monitor beside a 4k tv but that thing is a ultrawide that looks as crisp as my 4k monitor was. Just make sure the screen has decent refresh rate and low input lag. I hated my 4k monitor for its bad response time. Got rid of it for that.

If you play on a console and a 4k tv then you dont have much choice ofcourse but 4k is still worth it.