You are right. I have seen an 80" sharp at fry's with the interpolation set to "the young and the restless mode" and at that size it creates all kinds of problems (I don't like frame interpolation period). I have a friend with the full array backlit version and in her home enviroment, blu rays look pretty good (frame interpolation off of course). It has the normal lcd issues, but it looks good from the right viewing distance. I do think I would want a 4k set at this size, however, because you do start to notice the screen door effect if you get within 5 or 6 feet of it. I have a 65" set now and don't see pixels until I am way closer to it than I would ever watch from, about the same time I start to see dithering. I think 75" is the max I would want at 1080p, beyond that and I see 4k as the best option. I don't see the point of these 55" 4k tvs though.