Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | TCL - QM7K Mini-LED 75 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Peak brightness | 3500 nits | 2100 nits |
| Screen size | 75 " | 65 " |
| Dolby Vision | true | false |
| Smart OS | Google TV | Tizen |
| Panel type | Mini-LED | QD-OLED |
Between the QM7K Mini-LED 75 and S90F QD-OLED 65, the QM7K Mini-LED 75 comes out ahead in peak brightness / screen size, while the S90F QD-OLED 65 wins on panel type. Overall, the QM7K Mini-LED 75 scores 76.4 and the S90F QD-OLED 65 scores 74.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.4 vs 74.7). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the QM7K 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. The biggest gaps in its favor are peak brightness, screen size, dolby vision, among others. The single most decisive one: Peak brightness — 66.67% more. 3500 nits vs 2100 nits.
Pick the S90F QD-OLED 65 if you care most about panel type. Its strongest claims are panel type. The single most decisive one: Panel type: QD-OLED (vs Mini-LED).
Both ship with comparable refresh rate, hdmi 2.1 ports, 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: TCL - QM7K Mini-LED 75 or Samsung - S90F QD-OLED 65?
TCL - QM7K Mini-LED 75 leads the current Mars Score by 1.7 points.The more useful decision is the trade-off behind that result: compare screen size, panel type against the way you will actually use the product.
Choose TCL - QM7K Mini-LED 75 if…
TCL - QM7K Mini-LED 75 has the measurable edge on peak brightness nits, screen size in, has dolby vision.
Choose Samsung - S90F QD-OLED 65 if…
Samsung - S90F QD-OLED 65 has the measurable edge on panel type.
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 TCL - QM7K Mini-LED 75 wins
- ▲Peak brightness — 66.67% more. 3500 nits vs 2100 nits.
- ▲Screen size — 15.38% more. 75 " vs 65 ".
- ▲Has Dolby Vision.
- ▲Smart OS: Google TV (vs Tizen).
Why Samsung - S90F QD-OLED 65 wins
- ▲Panel type: QD-OLED (vs Mini-LED).
Spec comparison
Display
| Spec | TCL - QM7K Mini-LED 75 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Screen size | 75 "lead | 65 " |
| Panel typeⓘ | Mini-LED | QD-OLEDlead |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 3500 nitslead | 2100 nits |
HDR & Smart
| Spec | TCL - QM7K Mini-LED 75 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| Dolby Visionⓘ | truelead | false |
| HDR10+ⓘ | true | true |
| Smart OS | Google TVlead | Tizen |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | TCL - QM7K Mini-LED 75 | Samsung - S90F QD-OLED 65 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4 | 4 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, QM7K Mini-LED 75 or S90F QD-OLED 65?+
QM7K Mini-LED 75 peaks at 3500 nits vs 2100 nits.
Which is better for gaming, QM7K Mini-LED 75 or S90F QD-OLED 65?+
QM7K Mini-LED 75 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does QM7K Mini-LED 75 or S90F QD-OLED 65 support Dolby Vision?+
QM7K Mini-LED 75 supports Dolby Vision; S90F QD-OLED 65 does not.