Between the C5 OLED 55 and S90F QD-OLED 65, the C5 OLED 55 comes out ahead in dolby vision and smart os, while the S90F QD-OLED 65 wins on peak brightness and screen size. Overall, the C5 OLED 55 scores 60.5 and the S90F QD-OLED 65 scores 67.5 on our Mars Score.
Which should you buy?
The S90F QD-OLED 65 edges ahead on the Mars Score (60.5 vs 67.5), but the 7.0-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the C5 OLED 55 if you care most about dolby vision and smart os. The biggest gaps in its favor are dolby vision, smart os.
Pick the S90F QD-OLED 65 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are peak brightness, screen size, panel type.
Both ship with comparable refresh rate, hdmi 2.1 ports, vrr, so those specs don't separate the two — focus on the differences below.
Bottom line: the S90F QD-OLED 65 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why LG - C5 OLED 55 wins
- ▲Has Dolby Vision.
- ▲Smart OS: webOS (vs Tizen).
Why Samsung - S90F QD-OLED 65 wins
- ▲Peak brightness — 61.54% more. 2100 nits vs 1300 nits.
- ▲Screen size — 18.18% more. 65 " vs 55 ".
- ▲Panel type: QD-OLED (vs OLED).
Spec comparison
Display
| Spec | LG - C5 OLED 55 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Screen sizeⓘ | 55 " | 65 "lead |
| Panel typeⓘ | OLED | QD-OLEDlead |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 1300 nits | 2100 nitslead |
HDR & Smart
| Spec | LG - C5 OLED 55 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Dolby Visionⓘ | truelead | false |
| HDR10+ⓘ | false | truelead |
| Smart OS | webOSlead | Tizen |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | LG - C5 OLED 55 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4 | 4 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, C5 OLED 55 or S90F QD-OLED 65?+
S90F QD-OLED 65 peaks at 2100 nits vs 1300 nits.
Which is better for gaming, C5 OLED 55 or S90F QD-OLED 65?+
C5 OLED 55 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does C5 OLED 55 or S90F QD-OLED 65 support Dolby Vision?+
C5 OLED 55 supports Dolby Vision; S90F QD-OLED 65 does not.
Spec-level deep dives
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