AI Upscaling Engine Comparison
LG C5's AI upscaling generally preserves natural texture, film grain, and subtle shadow detail, producing a softer but more cinematic 4K image from lower-resolution sources; its processing rarely looks aggressive, though some fine edges can appear slightly less defined. Samsung S90H usually delivers a sharper, more contrast-rich result, with AI enhancement that makes upscaled content look punchy and immediate, but it can occasionally introduce halos, sharpening artifacts, or exaggerated noise around faces and text. For viewers who prefer a restrained, film-like presentation, LG's engine often feels more consistent across mixed streaming, broadcast, and disc content.
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The better choice depends on source quality, viewing distance, room brightness, and personal taste rather than a single benchmark. Samsung's stronger enhancement can flatter clean, high-bitrate material and bright-room viewing, while LG's gentler processing may suit darker rooms and older or noisier sources. Adjusting sharpness, noise reduction, and motion settings can narrow the gap considerably, so compare both with your usual movies, sports, and games before deciding.
4K Detail and Texture
When comparing the LG C5 and Samsung S90H for 4K upscaling, the difference is less about raw sharpness and more about how each TV interprets detail. The S90H often presents a cleaner, more polished image from HD sources, smoothing noise and emphasizing edges without making faces look waxy. The C5, meanwhile, tends to retain more of the original texture, including film grain and subtle surface detail, which can make movies feel less processed. For streaming, both are strong, but the S90H may look more immediately impressive on bright, compressed content.
Neither set magically creates true 4K information, so expectations should stay realistic. If you prefer a crisp, modern look with fewer artifacts, the S90H is likely the better fit. If you value natural texture and a more cinematic presentation, the C5 remains compelling. Room lighting, source quality, and picture settings matter as much as the panel, so auditioning both with your usual content is the smartest way to decide.
Bright Room Reflection Handling
In a bright room, reflections can wash out OLED contrast, so handling matters as much as peak brightness. The Samsung S90H tends to manage glare more confidently, preserving shadow detail when sunlight hits the screen, while the LG C5 still delivers excellent black levels but can look more mirror-like under direct light. For viewers who cannot fully control ambient lighting, that difference can make the Samsung feel more forgiving during daytime sports or streaming. Still, both panels reward dimmer viewing with deep, cinematic contrast.
When upscaling to 4K, the LG C5 often looks slightly more natural with lower-resolution content, smoothing noise without over-sharpening faces or textures. The Samsung S90H can appear crisper and more aggressive, adding perceived detail that some viewers prefer for older shows or compressed streams. Neither set magically creates true 4K information, but each uses processing to make non-native sources cleaner. The better choice depends on whether you value subtle realism or punchy clarity, especially in a bright living room.
Gaming and Motion Performance
When comparing the LG C5 and Samsung S90H for 4K upscaling, both make lower-resolution content look detailed, but their processing styles differ. The LG C5 favors a smoother, more natural image, preserving film grain and avoiding harsh edges, so older broadcasts and compressed streams feel less artificial. Samsung's S90H pushes sharper textures and stronger contrast, so fine details pop, yet that aggressiveness may introduce slight ringing or over-enhanced noise on weaker sources. For mixed viewing, LG's consistency is easier to trust, while Samsung rewards high-quality 1080p material with a punchier presentation.
For gaming and motion, both OLEDs benefit from near-instant response times, but upscaling matters when consoles render below native 4K or motion interpolation is active. The LG C5 keeps motion cleaner during fast pans and maintains stable detail in upscaled game feeds, whereas the S90H can look dynamic but exaggerates moving textures. If faithful 4K upscaling across varied content is your priority, the LG C5 is the safer pick; if you prefer a brighter, sharper look in a well-lit room, Samsung's S90H remains compelling.
Value for Upscaled Content
LG C5 generally delivers a polished 4K upscale from lower-resolution sources, with its processor smoothing compression artifacts while preserving facial detail and text edges. In side-by-side viewing, HD sports and older streaming titles look clean, though very soft sources can appear slightly smoothed rather than crisply reconstructed. Samsung S90H counters with a punchier upscale that emphasizes edge definition and fine texture, making 1080p Blu-rays and cable feeds look more immediately detailed. Its processing can also introduce a touch more sharpening on noisy broadcasts, so results depend on source quality and picture settings. For mixed viewing, LG feels more natural and forgiving, while Samsung can look more vivid on good inputs. Neither set magically creates true 4K detail, but both make everyday content far more watchable. If your library is mostly compressed streaming, LG C5 is the safer choice; if you prefer crisp, high-contrast presentation from decent HD sources, Samsung S90H has the edge.
OLED Upscaling Feature Comparison
| Feature | LG C5 | Samsung S90H |
|---|---|---|
| Upscaling Engine | α9 AI Processor 4K Gen8 | NQ4 AI Gen3 |
| Low-Res Detail | Strong texture recovery | Sharper edge enhancement |
| Noise Reduction | Natural, film-like | Aggressive, cleaner |
| 4K Result | Balanced cinematic look | Crisp, punchy clarity |