I just purchased a new Sony x900f 4k Tv. One thing I found out real quick is that the Tv itself will upscale any signal that isn't 4k....using a receivers 4k up scaling is pointless, at least so far. I turned my OPPO's up scaling off as well. Although I would think the OPPO's video processor is better than the Tv's...you can't turn it off on the Tv. The image produced when the up scaling is turned on is kinda weird...reflective even. At least it is on mine. It's not really annoying, but it does look "off" haha.