Both the LG 86QNED82AUA and the TCL 85C9K share a strong display foundation: native 4K (3840 x 2160) resolution, a 10-bit panel capable of rendering over a billion colors, Mini-LED backlighting for improved local dimming, and identical 178° horizontal and vertical viewing angles. At roughly 51–52 ppi across near-identical screen sizes, sharpness in everyday viewing is essentially the same for both.
The most impactful divergence is the refresh rate. The LG is capped at 60Hz, which is perfectly adequate for standard broadcast and streaming content, but the TCL steps up to 144Hz — a significant real-world advantage for fast-motion content, gaming, and any source that can push a high frame rate. Alongside this, the TCL's adaptive sync support extends to AMD FreeSync Premium Pro, versus the LG's basic FreeSync, meaning the TCL is far better equipped to eliminate screen tearing and stuttering at variable frame rates. The TCL also carries the QLED designation, indicating a quantum dot filter layer that typically widens the color gamut beyond standard LED-LCD panels.
On HDR, the gap widens further. The LG supports only HDR10 and HLG, while the TCL adds HDR10+ and Dolby Vision — the two dominant dynamic metadata formats used by major streaming services and Blu-ray releases. Dynamic metadata adjusts brightness and contrast on a scene-by-scene or frame-by-frame basis, which is a meaningful picture quality advantage over the LG's static HDR10. Overall, the TCL 85C9K holds a clear edge in this category: its higher refresh rate, broader HDR ecosystem, and stronger adaptive sync stack make it the more capable display, particularly for gaming and premium streaming content.