Which is better for a bright living room?

The G4. Its Micro Lens Array panel and anti-reflection coating hold up better against daylight and window glare. The C4 is still a strong OLED but loses some punch in a very bright room.

Is the G4 worth stepping up to over the C4?

If you wall-mount and watch a lot of HDR movies or sport in a bright room, yes. If you mostly watch at night or want the biggest screen, the C4 gives most of the picture quality for less.

Which is better for gaming?

They are close. Both do 120 Hz with HDMI 2.1 and VRR. The C4 lists four HDMI 2.1 ports and G-Sync certification, which suits console and PC setups well. The G4 adds a brighter panel for HDR games.

Do either come with a stand?

The C4 includes a pedestal stand. The G4 is designed as a gallery TV and ships with a flush wall mount; a stand is sold separately in most sizes.

Both use OLED panels with similar lifespans and LG's pixel refresh features. The G4's brighter panel runs harder for HDR, but neither has a clear durability edge; panel care settings matter more than the model.

Can I get a bigger screen on the C4?

Yes. This C4 is the 83-inch model, and the C4 line also covers smaller sizes. The G4 tops out at 97 inches but in fewer sizes overall.

LG OLED evo G4 Series 4K TV vs LG C4 OLED evo 4K Smart TV

Both are LG OLED evo sets with 120 Hz panels, HDMI 2.1 and the same webOS platform, so picture quality is close. The G4 is the brighter, more premium build: it uses LG's Micro Lens Array panel and a flush wall-mount design, and reviewers rate it among the best OLEDs for HDR highlights. The C4 is the better value for most rooms and comes in the huge 83-inch size. Buy the G4 for a bright room or a clean wall install; buy the C4 for a big screen at a lower cost.

Choose the LG G4 if you want the brightest OLED picture, a slim gallery-style wall mount and the best HDR impact LG makes.
Choose the LG C4 if you want a large 83-inch OLED, full gaming features and strong value without paying for the brighter panel.

Prices

LG OLED evo G4 Series 4K TV: $2,275.27 used at eBay (last seen Oct 30)