Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | LG - C5 OLED 65 | TCL - QM851 Mini LED 65 |
|---|---|---|
| Peak brightness | 1300 nits | 5000 nits |
| HDMI 2.1 ports | 4 | 2 |
| Panel type | OLED | Mini-LED |
| Smart OS | webOS | Google TV |
Between the C5 OLED 65 and QM851 Mini LED 65, the C5 OLED 65 comes out ahead in hdmi 2.1 ports / panel type, while the QM851 Mini LED 65 wins on peak brightness / smart os. Overall, the C5 OLED 65 scores 69 and the QM851 Mini LED 65 scores 76.2 on our Mars Score.
Which should you buy?
The QM851 Mini LED 65 edges ahead on the Mars Score (69 vs 76.2), but the 7.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the C5 OLED 65 if you care most about hdmi 2.1 ports / panel type. The biggest gaps in its favor are hdmi 2.1 ports, panel type. The single most decisive one: HDMI 2.1 ports — 2.00 more. 4 vs 2.
Pick the QM851 Mini LED 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, smart os. The single most decisive one: Peak brightness — 284.62% more. 5000 nits vs 1300 nits.
Both ship with comparable screen size, refresh rate, dolby vision, so those specs do not separate the two — focus on the differences below.
Bottom line: the QM851 Mini LED 65 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: LG - C5 OLED 65 or TCL - QM851 Mini LED 65?
TCL - QM851 Mini LED 65 leads the current Mars Score by 7.2 points.The more useful decision is the trade-off behind that result: compare panel type, hdmi 2.1 ports against the way you will actually use the product.
Choose LG - C5 OLED 65 if…
LG - C5 OLED 65 has the measurable edge on hdmi 2 1 count, panel type.
Choose TCL - QM851 Mini LED 65 if…
TCL - QM851 Mini LED 65 has the measurable edge on peak brightness nits, 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 - C5 OLED 65 wins
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
- ▲Panel type: OLED (vs Mini-LED).
Why TCL - QM851 Mini LED 65 wins
- ▲Peak brightness — 284.62% more. 5000 nits vs 1300 nits.
- ▲Smart OS: Google TV (vs webOS).
Spec comparison
Display
| Spec | LG - C5 OLED 65 | TCL - QM851 Mini LED 65 |
|---|---|---|
| Screen size | 65 " | 65 " |
| Panel typeⓘ | OLEDlead | Mini-LED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 1300 nits | 5000 nitslead |
HDR & Smart
| Spec | LG - C5 OLED 65 | TCL - QM851 Mini LED 65 |
|---|---|---|
| Dolby Visionⓘ | true | true |
| HDR10+ⓘ | false | truelead |
| Smart OS | webOS | Google TVlead |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | LG - C5 OLED 65 | TCL - QM851 Mini LED 65 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4lead | 2 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, C5 OLED 65 or QM851 Mini LED 65?+
QM851 Mini LED 65 peaks at 5000 nits vs 1300 nits.
Which is better for gaming, C5 OLED 65 or QM851 Mini LED 65?+
C5 OLED 65 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does C5 OLED 65 or QM851 Mini LED 65 support Dolby Vision?+
Both support Dolby Vision.