Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | LG - G5 OLED evo 77 | TCL - C855 Mini LED 65 |
|---|---|---|
| Screen size | 77 " | 65 " |
| Refresh rate | 165 Hz | 144 Hz |
| Peak brightness | 4000 nits | 3500 nits |
| HDMI 2.1 ports | 4 | 2 |
| Panel type | OLED | Mini-LED |
| Smart OS | webOS | Google TV |
Between the G5 OLED evo 77 and C855 Mini LED 65, the G5 OLED evo 77 comes out ahead in screen size / refresh rate, while the C855 Mini LED 65 wins on smart os. Overall, the G5 OLED evo 77 scores 82.8 and the C855 Mini LED 65 scores 74.3 on our Mars Score.
Which should you buy?
The G5 OLED evo 77 is the clear pick on raw spec strength, leading by 8.5 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
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 screen size, refresh rate, peak brightness, among others. The single most decisive one: Screen size — 18.46% more. 77 " vs 65 ".
Pick the C855 Mini LED 65 if you care most about smart os. Its strongest claims are smart os. The single most decisive one: Smart OS: Google TV (vs webOS).
Both ship with comparable dolby vision, vrr, so those specs do not separate the two — focus on the differences below.
Bottom line: the G5 OLED evo 77 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 - G5 OLED evo 77 or TCL - C855 Mini LED 65?
LG - G5 OLED evo 77 leads the current Mars Score by 8.5 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 77 if…
LG - G5 OLED evo 77 has the measurable edge on screen size in, refresh rate hz, peak brightness nits.
Choose TCL - C855 Mini LED 65 if…
TCL - C855 Mini LED 65 has the measurable edge on 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 77 wins
- ▲Screen size — 18.46% more. 77 " vs 65 ".
- ▲Refresh rate — 14.58% more. 165 Hz vs 144 Hz.
- ▲Peak brightness — 14.29% more. 4000 nits vs 3500 nits.
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
- ▲Panel type: OLED (vs Mini-LED).
Why TCL - C855 Mini LED 65 wins
- ▲Smart OS: Google TV (vs webOS).
Spec comparison
Display
| Spec | LG - G5 OLED evo 77 | TCL - C855 Mini LED 65 |
|---|---|---|
| Screen size | 77 "lead | 65 " |
| Panel typeⓘ | OLEDlead | Mini-LED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 165 Hzlead | 144 Hz |
| Peak brightnessⓘ | 4000 nitslead | 3500 nits |
HDR & Smart
| Spec | LG - G5 OLED evo 77 | TCL - C855 Mini LED 65 |
|---|---|---|
| Dolby Visionⓘ | true | true |
| HDR10+ⓘ | false | truelead |
| Smart OS | webOS | Google TVlead |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | LG - G5 OLED evo 77 | TCL - C855 Mini LED 65 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4lead | 2 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, G5 OLED evo 77 or C855 Mini LED 65?+
G5 OLED evo 77 peaks at 4000 nits vs 3500 nits.
Which is better for gaming, G5 OLED evo 77 or C855 Mini LED 65?+
G5 OLED evo 77 offers 165Hz refresh and 4 HDMI 2.1 ports.
Does G5 OLED evo 77 or C855 Mini LED 65 support Dolby Vision?+
Both support Dolby Vision.