Sony X85K vs Sony X90K/X90CK

The Sony X90K/X90CK is a higher-end TV than the Sony X85K and is better overall. The X90K has a local dimming feature, which the X85K doesn't have, resulting in better overall picture quality because it displays deeper blacks and gets brighter, so highlights pop more in HDR. The X90K also uses a different processor with a few more features, like the S-Center speaker input, so if you want the best features and performance, the X90K is the better choice.