Both the Samsung QN85QN1EFAF and the TCL 98C8K share the same core display architecture — Mini-LED-backlit QLED LCD panels running at 4K (3840 x 2160) with a 144Hz refresh rate, 10-bit color depth, and 1.07 billion displayable colors. They also match on adaptive sync support (AMD FreeSync Premium Pro), wide 178° viewing angles in both directions, anti-reflection coatings, and ambient light sensors. For everyday viewing and gaming, these two TVs start from a very similar technical foundation.
The most meaningful differentiator in this group is HDR format support. The TCL 98C8K adds Dolby Vision on top of the HDR10, HDR10+, and HLG formats that both sets support. In practice, Dolby Vision uses dynamic, scene-by-scene metadata to optimize brightness and contrast, and it remains the dominant HDR format on streaming platforms like Netflix and Apple TV+. The Samsung's omission of Dolby Vision means it will fall back to HDR10 or HDR10+ for that content — a real-world limitation for users invested in streaming ecosystems.
The other key trade-off is size versus sharpness. The TCL's 98-inch screen is dramatically larger than the Samsung's 84.5 inches, but that comes at the cost of pixel density: 45 ppi versus the Samsung's 52 ppi. At typical living-room viewing distances the difference is unlikely to be obvious, but up close or in brighter rooms the Samsung will render finer detail more crisply. Overall, the TCL 98C8K holds a display edge for most buyers — it delivers a significantly larger canvas and adds Dolby Vision support — while the Samsung is the better pick if pixel-level sharpness or a more manageable screen footprint is the priority.