Same issue. When watching NLCS baseball game on Fox, the box informs me the game is in 4k, press info takes me to the 4k channel. 90% of the time, the picture on the 4k channel is dull and worse than HD. I did get it to work today and didn't change channel for fear that it would revert to dull color. After 8 innings, I changed to the ALCS game on TBS, just HD and the picture looked over saturated. Went back to 4k NLCS game and back to dull color. ALCS on TBS though back to normal HD quality, not over saturated. Seems like a signal issue with the xfinity box.
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