A:Answer Hi Angel,
Thank you very much for your inquiry!
Regarding your question, if you are comparing to the XR-77A80K, then the main difference between the two models (XR-85X90K & XR-77A80K) is the screen type. The XR-85X90K has LCD while the XR-77A80K offers Organic LED displays (OLED). With the BRAVIA XR A80K, you will enjoy a premium OLED picture with contrast and color that feels deep, natural, and real. The revolutionary Cognitive Processor XR™ reproduces content the way humans see and hear for an incredibly lifelike experience. Feel the action all around you with Acoustic Surface Audio+ and experience truly immersive sound that perfectly matches the picture on screen. And with the BRAVIA XR X90K Full Array LED TV, everything you watch becomes more detailed and immersive with true-to-life 4K picture, powered by the Cognitive Processor XR™. With immersive picture and sound, and sleek flush bezel design, be prepared to level up your favorite movies, TV shows, and games.
To learn more about each model, please visit Sony support website.
Hope this helps you, and thank you so much for considering Sony!
- Romeo