Upgrading to 4K reveals that monitor specs beyond resolution and refresh rate matter more than most buyers realize. Panel type (IPS vs VA vs OLED) significantly affects contrast and motion clarity. Pixel density varies meaningfully across screen sizes — 27-inch 4K delivers ~163 PPI while 42-inch drops to ~105 PPI, affecting sharpness at desk distance. Display size also impacts OS scaling behavior and GPU load. HDR certification is often misleading: HDR400 is largely worthless, with DisplayHDR 1000 being the practical minimum for IPS panels, while OLED handles HDR inherently better through per-pixel control.
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