Between the G5 OLED evo 77 and QM851 Mini LED 75, the G5 OLED evo 77 comes out ahead in refresh rate and screen size, while the QM851 Mini LED 75 wins on peak brightness and smart os. Overall, the G5 OLED evo 77 scores 82.3 and the QM851 Mini LED 75 scores 79.6 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (82.3 vs 79.6). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
Pick the G5 OLED evo 77 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are refresh rate, screen size, hdmi 2.1 ports, among others.
Pick the QM851 Mini LED 75 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, smart os.
Both ship with comparable dolby vision, vrr, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why LG - G5 OLED evo 77 wins
- ▲Refresh rate — 14.58% more. 165 Hz vs 144 Hz.
- ▲Screen size — 2.67% more. 77 " vs 75 ".
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
- ▲Panel type: OLED (vs Mini-LED).
Why TCL - QM851 Mini LED 75 wins
- ▲Peak brightness — 25.00% more. 5000 nits vs 4000 nits.
- ▲Smart OS: Google TV (vs webOS).
Spec comparison
Display
| Spec | LG - G5 OLED evo 77 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Screen sizeⓘ | 77 "lead | 75 " |
| Panel typeⓘ | OLEDlead | Mini-LED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 165 Hzlead | 144 Hz |
| Peak brightnessⓘ | 4000 nits | 5000 nitslead |
HDR & Smart
| Spec | LG - G5 OLED evo 77 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Dolby Visionⓘ | true | true |
| HDR10+ⓘ | false | truelead |
| Smart OS | webOS | Google TVlead |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | LG - G5 OLED evo 77 | TCL - QM851 Mini LED 75 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4lead | 2 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, G5 OLED evo 77 or QM851 Mini LED 75?+
QM851 Mini LED 75 peaks at 5000 nits vs 4000 nits.
Which is better for gaming, G5 OLED evo 77 or QM851 Mini LED 75?+
G5 OLED evo 77 offers 165Hz refresh and 4 HDMI 2.1 ports.
Does G5 OLED evo 77 or QM851 Mini LED 75 support Dolby Vision?+
Both support Dolby Vision.
Spec-level deep dives
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