Same here. Live sports look terrible. Nothing from Comcast looks like it is in HD on this TV. 4K content on Netflix and BluRay movies look amazing. I have a RG6 line homerun from the cable box outside to the tv inside. Comcast tech came out and replaced all cable ends, splitter, ground block, and verified the signal was strong at the tv. He admitted that the picture should look better than it does. We bypassed my AV receiver, changed hdmi cables, changed input on the TV, changed TV settings, and tried every output resolution on the cable box. It all looks like garbage! Very frustrating. 1080p60 output was the worst, the picture skipped very badly as if I was watching programming through a strobe light. Side note- I have 2 high-end 720p plasma TVs that are 10 years old. They both look great, way better than the new 4K. I assume this is because 720p is the native resolution being received by the cable box so the processing from cable box to tv is minimal.
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