I saw your reddit comment, but I couldn't find the source for the TCL 65 inch? For me im tempted to go from 43" 4k to 55" 8k, my only concern is the edges being too far away unless its curved.
Who knows how much it will cost... My theory for the low prices for the 55" 8k TVs is that most people in the TV market go for the 65" version.