Sony X90K 65" (Full Array LED) vs Vizio M-Series 55"
The Verdict
Sony X90K delivers superior picture quality with its full array LED backlight system achieving 1200 nits brightness compared to Vizio's 800 nits, resulting in more dramatic contrast and deeper blacks. The 65-inch screen size versus Vizio's 55-inch provides noticeably more immersive viewing for most living rooms. Both offer identical 8ms input lag and VRR support for gaming, making them functionally equivalent for console and PC gaming. Audio output matches at 20 watts across both models, though Sony includes Dolby Atmos support while Vizio omits it. The Vizio counters with Wi-Fi 6 connectivity and Bluetooth 5.0 versus Sony's older Wi-Fi 5 and Bluetooth 4.2, plus its Quantum LED technology handles bright rooms adequately. However, the Sony justifies its $650 premium through superior contrast performance, larger screen real estate, and better backlight precision that translates to noticeably better blacks and shadow detail. The Vizio represents excellent value at $449 for a competent 4K gaming display with modern connectivity, but the Sony X90K is the stronger overall performer if your budget allows.
Who Should Buy
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
Buy the Vizio M-Series 55" if…
- →120Hz with VRR and 4K@120Hz at under $450 is great for console gamers
- →Dolby Vision and HDR10+ dual support
- →Four HDMI 2.1 ports — enough for every console and streaming device
Category Scores
Pros & Cons
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
Vizio M-Series 55"
Pros
- 120Hz with VRR and 4K@120Hz at under $450 is great for console gamers
- Dolby Vision and HDR10+ dual support
- Four HDMI 2.1 ports — enough for every console and streaming device
- Wi-Fi 6 and Chromecast built-in for fast streaming
- Quantum color delivers better color volume than basic LED
Cons
- SmartCast OS is slow and has fewer apps than Google TV
- 800-nit brightness is adequate but not impressive for HDR
- No local dimming zones — contrast is limited
- Vizio's long-term software support and update track record is inconsistent
Full Specifications
| Spec | Sony X90K 65" (Full Array LED) | Vizio M-Series 55" |
|---|---|---|
| Body | ||
| VESA mount | 300 x 300mm | 200 x 200mm |
| Weight | 46.3 lbs | 28.0 lbs |
| Dimensions | 57.2 x 33.1 x 2.7 inches | — |
| Dimensions (w/ stand) | 57.2 x 35.3 x 12.0 inches | 48.3 x 30.4 x 10.6 inches |
| Audio | ||
| Output (watts) | 20 | 20 |
| Speakers | 2.0ch Acoustic Multi-Audio | 2.0ch |
| Dolby Atmos | ||
| Gaming | ||
| VRR (Variable Refresh Rate) | ||
| ALLM | ||
| Input lag (ms) | 8 | 8 |
| Display | ||
| HDR | Dolby Vision, HDR10, HLG | Dolby Vision, HDR10+, HLG |
| Size | 65" | 55" |
| Type | Full Array LED (VA LCD) | Quantum LED |
| Resolution | 3840 x 2160 (4K) | 3840 x 2160 (4K UHD) |
| Refresh rate | 120Hz | 120Hz (native) |
| Brightness (nits) | 1200 | 800 |
| Smart TV | ||
| Os | Google TV | SmartCast OS |
| Voice assistant | Google Assistant, Alexa | Google Assistant, Apple AirPlay 2, Chromecast |
| Connectivity | ||
| Wi-Fi | Wi-Fi 5 | Wi-Fi 6 (802.11ax) |
| Ethernet | ||
| Bluetooth | 4.2 | 5.0 |
| USB ports | 2 | 1 |
| HDMI ports | 4 | 4 |
| Processor | ||
| Chipset | — | IQ Active Processor |
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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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