I don't directly see the pixels per se like on 1080p at 27-inch at desktop distances. But I see harsh edges in corners and text is not flawless like on 2160p.

Like I said, it's on the cusp of invisible pixels.

Gamers often use antialias settings to smooth out harsh edges, whereas an inconsistent frame rate will literally cost you a game victory in many fast-action games. Many esports professionals use low graphics settings for this reason.

I've not tried but I've heard that a butter-smooth 90, 120, or 300 FPS frame rate (that is also synchronized with the display) is really wonderful in many such games, and once you experience that you can't go back. On less powerful systems it then requires making a tradeoff with rendering quality and resolution.