The new XG1V4 (4k) box is capable of UHD and HDR/WCG; however, Comcast has no content to display these upgrades. Not even Netflix, when accessed through the new 4k box, will display 4k content yet. I can't speak to why the image is "fuzzy" as with digital signal it would just break up into little boxes aka pixelation. It could just be due to the fact you are taking an image meant for 1.2million pixels and spreading that to 8million pixels on the 4k tv. You could also have to many signal processing options enabled on the TV. Lastly it could be that the TV has terrible upscaling capabilities. If you are going to let the cable box upscale the image then the receiver and then the TV, that may be another issue as well. Having the home rewired is not going to help any. You can verify this by asking the tech to run a temp line from outside your home directly into the cable box. That would help determine if you actually need the home to be rewired or not. No reason you should spend the money to do that if you don't need. Hope this helps.
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