Both LG G1 and Panasonic JZ2000 TV are OLED TVs.
Difference
1. LG G1 uses OLED evo panel, Panasonic JZ2000 use an OLED panel. OLED evo can bring a higher brightness to TV.
2. HDMI 2.1. Both TV has 4 HDMI ports, except Panasonic has two HDMI 2.1 ports. 4 of LG G1 TV's HDMI supports HDMI 2.1.
3. Audio: Panasonic JZ2000 comes with a big speaker of 125 W. LG G1 has a 60W speaker. If you want a better sound quality, you can connect the TV to a soundbar.
4. System: Panasonic uses its system which called My home screen, an LG G1 uses LG's webOS.
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Panasonic JZ2000 vs. LG G1 TV Review