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And one more question about a80k and a84k what the really difference is between them
Hi @Jack1968
My go to place for TV Specifications is 54.6" Sony XR-55A80K - Specifications (displayspecifications.com)
The refresh rate is 40 Hz - 120 Hz so both websites are correct. The product reference guide states 3840 × 2160p (100, 120 Hz).
You will also see that the XR-55A84K is just a model alias of the XR-55A80K. I would always opt for the higher number (84). Sometimes the only difference is cosmetics or slightly different stands.
I'm sorry if you are expecting an answer from Sony, but this is a customer helps customer community and not Sony Support.