The 81 is only edge lit, which is older technology and can't do proper local dimming or HDR as well. As it won't go as bright or be able to control the dimming as precisely as the 86. It doesn't have any Dolby or a sub woofer.
Here is a slide by side comparison of the two - displayspecifications.com/en/…af8
The rest of the features and connections etc are almost the same."}],"commentCount":2,"interactionStatistic":1,"articleSection":"Retailer Offers and Issues"}