[j1elo]

Comparing side-by-side is always easier. The question is never that (should not be). The question is, would you approach a random coworker's desktop and really, sincerely, notice if they have a 120 vs a 144 Hz (or 240) monitor?

I'd say maybe if you are a professional in the sector of multimedia processing, you would be so accostumed to the smoothness of high FPS that a meager 60 fps monitor would be obviously noticeable. But for the untrained eye, I feel most people wouldn't even notice in a random scenario like that, whether the screen is 60 or 120 (and that's the range with highest ROI on FPS increments!)