The LG B4 OLED 77 outperforms the LG QNED80 55 in contrast and black levels according to RTINGS and CNET reviews, making it the stronger choice for cinematic viewing despite the size difference. The QNED80 55 edges ahead in bright-room brightness per Consumer Reports data but suffers from blooming. LG B4 OLED 77 wins overall for most users seeking premium picture quality.