Which is better for gaming?

The C6. It reaches 165Hz VRR with 0.1ms response and adds QMS and QFT on top of G-Sync and FreeSync Premium. The C4 is still a strong 120Hz gaming set with four HDMI 2.1 ports.

Is the C6 noticeably brighter?

Yes. The C6 uses an evo panel with Brightness Booster, which LG positions above the standard C4 panel. The gap shows most in bright rooms and HDR highlights.

Both are OLED sets with similar panel life and LG's OLED Care features. The C4 has years of owner feedback behind it; the C6 is too new for long-term reports.

Should I step up to the C6 from the C4?

Step up if you want the larger 55-inch screen, more brightness and the fastest gaming specs. Stay with the C4 if 48 inches suits your room and you prefer a proven model.

Does the size difference matter?

A 55-inch screen is roughly 30 percent larger in area than a 48-inch one. Check your viewing distance and wall space before deciding.

Do both support Dolby Vision and Atmos?

Yes. Both handle Dolby Vision and Dolby Atmos, and both include FILMMAKER MODE. The C6 adds a 2.2 channel 40W speaker system.

LG OLED evo C6 55" 4K Smart TV vs LG OLED48C4PUA OLED TV

The C6 is the newer, brighter, faster set: a 55-inch evo panel with Brightness Booster, the α11 Gen3 processor, 165Hz VRR and four full HDMI 2.1 ports. The C4 is a 48-inch 2024 model with the α9 Gen7 chip and the same core OLED strengths, well liked by owners at 4.6 out of 5. Buy the C6 for a larger, brighter screen and the best gaming headroom; buy the C4 if 48 inches fits your room and you want proven C-series performance.

Choose the LG C6 if you want the bigger 55-inch picture, higher brightness and the fastest gaming specs LG offers in this class.
Choose the LG OLED48C4 if your space suits a 48-inch screen and you value a well-reviewed, mature C-series set over the newest panel.

Prices

LG OLED evo C6 55" 4K Smart TV: $949.00 at Greentoe (last seen Nov 10)