Sony made this for the person who wants every possible advantage in fast competitive games. The screen refreshes 540 times per second — more than twice what most gaming monitors do — so motion is absurdly smooth and you see updates from the game faster than your opponent does. Combine that with OLED's instant pixel response and you get the cleanest, most responsive picture available.
OLED also means perfect blacks when games get dark, and colors that pop without looking fake. The screen is 27 inches at 1440p, which is the sweet spot for competitive gaming — sharper than 1080p, easier to run at high frame rates than 4K. HDR here is real, not the fake sticker kind, so bright explosions and muzzle flashes actually stand out.
This is overkill if you play casual games or work from the monitor all day. It's designed for someone grinding ranked matches who wants the hardware to keep up with their skill.