The X8ok X85K have bluetooth and there all backlit.
The X85 and X80 have a 4k upscale processor the X72 has standard Bravia
The X85 and X80 have calrity enhancement realality pro the X72 nothing
The X85 and X80 have colour enhancement Triluminous Pro the X72 standars Triluminous (The X80’s have mid range quantum dot filter. the X72 entry level processor)
The X85 and X85 have contrast enhancer, oject based remaster, the X72 standard dynamic.
The x85 and x80 have motion flow xr800 and xr200, the X72 no motion enhancer. (The x85 is 120hz so has the x8r00 chip the X80 xr200)
As youve ruled out the X72 due to bluetooth the x80k is next up and would have superior picture quality to the x72 anyway. The X80k is a midrange TV if it tickles your pickle 🙂 and the 85K is £60 more again at costco but, not a hot buy so has no further discount but, is alot cheaper from normal retail stores. The 85k is upper midrange and sits just below Sony’s entry level flag ship range.
For what its worth if money was no object to me I’d opt for the 85k especially with such a narror price difference from the 80k. If that helps 🙂