Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | LG - G5 OLED evo 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Peak brightness | 4000 nits | 5000 nits |
| Screen size | 65 " | 75 " |
| Refresh rate | 165 Hz | 144 Hz |
| HDMI 2.1 ports | 4 | 2 |
| Panel type | OLED | Mini-LED |
| Smart OS | webOS | Google TV |
Between the G5 OLED evo 65 and QM851 Mini LED 75, the G5 OLED evo 65 comes out ahead in refresh rate / hdmi 2.1 ports, while the QM851 Mini LED 75 wins on peak brightness / screen size. Overall, the G5 OLED evo 65 scores 80.4 and the QM851 Mini LED 75 scores 78.2 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (80.4 vs 78.2). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the G5 OLED evo 65 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, hdmi 2.1 ports, panel type. The single most decisive one: Refresh rate — 14.58% more. 165 Hz vs 144 Hz.
Pick the QM851 Mini LED 75 if you care most about peak brightness / screen size. Its strongest claims are peak brightness, screen size, smart os. The single most decisive one: Peak brightness — 25.00% more. 5000 nits vs 4000 nits.
Both ship with comparable dolby vision, vrr, so those specs do not 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 says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: LG - G5 OLED evo 65 or TCL - QM851 Mini LED 75?
LG - G5 OLED evo 65 leads the current Mars Score by 2.2 points.The more useful decision is the trade-off behind that result: compare screen size, panel type, refresh rate, hdmi 2.1 ports against the way you will actually use the product.
Choose LG - G5 OLED evo 65 if…
LG - G5 OLED evo 65 has the measurable edge on refresh rate hz, hdmi 2 1 count, panel type.
Choose TCL - QM851 Mini LED 75 if…
TCL - QM851 Mini LED 75 has the measurable edge on peak brightness nits, screen size in, smart os.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why LG - G5 OLED evo 65 wins
- ▲Refresh rate — 14.58% more. 165 Hz vs 144 Hz.
- ▲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.
- ▲Screen size — 15.38% more. 75 " vs 65 ".
- ▲Smart OS: Google TV (vs webOS).
Spec comparison
Display
| Spec | LG - G5 OLED evo 65 | TCL - QM851 Mini LED 75 |
|---|---|---|
| Screen size | 65 " | 75 "lead |
| 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 65 | 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 65 | 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 65 or QM851 Mini LED 75?+
QM851 Mini LED 75 peaks at 5000 nits vs 4000 nits.
Which is better for gaming, G5 OLED evo 65 or QM851 Mini LED 75?+
G5 OLED evo 65 offers 165Hz refresh and 4 HDMI 2.1 ports.
Does G5 OLED evo 65 or QM851 Mini LED 75 support Dolby Vision?+
Both support Dolby Vision.