LG C4 65" vs Sony X90K 65" (Full Array LED)
The Verdict
LG's C4 commands a $700 premium over Sony's X90K, and that price gap reflects genuine technical advantages. The C4's OLED evo panel delivers superior contrast with perfect blacks and wider viewing angles compared to the X90K's full-array LED backlight. Brightness reaches 1300 nits on the LG versus 1200 nits on the Sony, giving the edge in bright rooms. Gaming performance favors the C4 with 1ms input lag against the X90K's 8ms, plus LG's α9 Gen 7 processor handles upscaling more effectively. Audio differs significantly: LG provides 60 watts across 2.2 channels with Dolby Atmos, while Sony's 20-watt 2.0 system sounds noticeably thinner. The X90K does offer excellent value for budget-conscious buyers and handles sports and general viewing admirably at $1099. However, the C4's superior motion handling, gaming responsiveness, and picture quality make it the better choice for enthusiasts prioritizing performance. Sony's advantage lies purely in price and weight (46.3 lbs versus 52.9 lbs). For serious movie and gaming content, the C4's premium features justify the cost.
Who Should Buy
Buy the LG C4 65" if…
- →Perfect black levels from self-emissive OLED pixels — best-in-class contrast
- →All four HDMI 2.1 ports at full bandwidth with VRR, ALLM, and G-Sync Compatible
- →1ms input lag makes it one of the best gaming TVs at any price
Buy the Sony X90K 65" (Full Array LED) if…
- →Excellent Sony image processing at a competitive mid-range price
- →Full Array Local Dimming provides solid contrast for an LED TV
- →Dolby Vision and Dolby Atmos for home theater HDR experience
Category Scores
Pros & Cons
LG C4 65"
Pros
- Perfect black levels from self-emissive OLED pixels — best-in-class contrast
- All four HDMI 2.1 ports at full bandwidth with VRR, ALLM, and G-Sync Compatible
- 1ms input lag makes it one of the best gaming TVs at any price
- Dolby Vision IQ and Dolby Atmos support for premium cinematic experience
- webOS 24 is clean, fast, and nearly ad-free compared to Tizen
Cons
- OLED burn-in risk with prolonged static content (e.g. news tickers, HUDs)
- Peak brightness trails Mini-LED rivals in very bright HDR highlights
- Slightly lower brightness than the G4, limiting HDR pop in sunlit rooms
- USB-A ports are only USB 2.0 speed
Sony X90K 65" (Full Array LED)
Pros
- Excellent Sony image processing at a competitive mid-range price
- Full Array Local Dimming provides solid contrast for an LED TV
- Dolby Vision and Dolby Atmos for home theater HDR experience
- 120Hz with VRR and ALLM — capable gaming display
- Google TV with Chromecast built-in for seamless streaming
Cons
- Only 2 of 4 HDMI ports support 4K@120Hz
- 20W audio is very weak — soundbar essential
- Bluetooth 4.2 and Wi-Fi 5 are behind current standards
- Some blooming visible with full array backlighting in dark scenes
Full Specifications
| Spec | LG C4 65" | Sony X90K 65" (Full Array LED) |
|---|---|---|
| Body | ||
| VESA mount | 300 x 200mm | 300 x 300mm |
| Weight | 52.9 lbs | 46.3 lbs |
| Dimensions (w/ stand) | 57.0 x 36.9 x 10.1 inches | 57.2 x 35.3 x 12.0 inches |
| Dimensions | — | 57.2 x 33.1 x 2.7 inches |
| Audio | ||
| Output (watts) | 60 | 20 |
| Speakers | 2.2ch | 2.0ch Acoustic Multi-Audio |
| Dolby Atmos | ||
| Gaming | ||
| VRR (Variable Refresh Rate) | ||
| ALLM | ||
| Input lag (ms) | 1 | 8 |
| Display | ||
| HDR | Dolby Vision IQ, HDR10, HLG, Filmmaker Mode | Dolby Vision, HDR10, HLG |
| Size | 65" | 65" |
| Type | OLED evo | Full Array LED (VA LCD) |
| Resolution | 3840 x 2160 (4K UHD) | 3840 x 2160 (4K) |
| Refresh rate | 120Hz | 120Hz |
| Brightness (nits) | 1300 | 1200 |
| Smart TV | ||
| Os | webOS 24 | Google TV |
| Voice assistant | ThinQ AI, Alexa, Google Assistant | Google Assistant, Alexa |
| Processor | ||
| Chipset | α9 Gen 7 AI Processor 4K | — |
| Connectivity | ||
| Wi-Fi | Wi-Fi 6 (802.11ax) | Wi-Fi 5 |
| Ethernet | ||
| Bluetooth | 5.0 | 4.2 |
| USB ports | 3 | 2 |
| HDMI ports | 4 | 4 |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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