Which has the better picture, the G4 or the G2?

The G4. Its newer OLED evo panel and α11 processor produce more brightness and cleaner upscaling. The G2 still delivers deep blacks and strong HDR, but it is a step behind in peak brightness.

Is the G4 worth stepping up to over the G2?

Yes if you watch a lot of HDR content or game, where the extra brightness and newer processing show. If the set will mostly run SDR streaming in a dim room, the G2 covers the basics well.

Which is better for gaming?

Both run 120 Hz with four HDMI ports and low input lag. The G4's newer processor and brighter panel give it the edge for HDR games and fast motion.

Do both support Dolby Vision and Dolby Atmos?

Yes. The G2 lists Dolby Vision IQ and Dolby Atmos, and the G4 carries Dolby Vision with a 4.2.2-channel Atmos system.

Neither has a published lifespan advantage. The G4's newer panel and chip mean it will stay current with firmware and app support longer, which matters more than hardware wear.

Can both be wall-mounted flush?

Yes. Both are Gallery-series designs built for a near-flush wall mount. At 97 inches you need studs or blocking rated for the weight.

LG OLED evo G4 97-Inch TV vs LG OLED97G2CUA OLED TV

Both are 97-inch 4K OLED TVs at 120 Hz with four HDMI ports, so the picture fundamentals are close. The G4 is the newer generation: a brighter OLED evo panel with the α11 processor, a flush gallery design, and a 4.2.2-channel 60W sound system. The G2 is the older Gallery Edition with the α9 Gen5 chip and a 4.2-channel 60W system, and it remains a strong set. Buy the G4 for the brightest picture and the longest useful life; buy the G2 if you want the same giant OLED screen and can accept slightly less brightness and an older processor.

Choose the LG G4 if you want the brightest 97-inch OLED LG makes, the newer α11 processor, and the longest stretch before the set feels dated.
Choose the LG G2 if a 97-inch OLED is the goal and you are fine with the previous-generation panel brightness and α9 Gen5 chip.

Prices

LG OLED evo G4 97-Inch TV: $23,185.00 at IT Vision Networks (last seen Nov 9)