Thank you, I didn't really have a grasp of the Sony model hierarchy.
I'll see if I can find the price of the X95J...I might splash out!
For their 2021 LCDs, it goes like this, from the top on down:
Master Series Z9J (comes in 75" and 85")
X95J (65", 75" and 85")
X90J + X93J/X94J (50", 55", 65" and 75")
X85J + X89J (43", 50", 55", 65", 75" and 85")
X80J + X81J (43", 50", 55", 65" and 75")
So X81J is a variant of X80J. These number variations for the same TV usually mean that they're sold at different retailers, offer somewhat different accessories (like stands) and so on. The X85J and X80J are both edge-lit, and use the "standard" X1 processor. The Z9J, X95J and X90J give you full-array local dimming and the latest, most advanced XR processor.
Like TomRetro said, the X95J is the successor to last year's XH9505. The X90J replaces the XH9005, and the Z9J replaces the ZH8.