What Is 4K TV? Should You Buy A 4K TV? - Which?

What is 4K TV and is 4K TV really worth paying extra for? What's the difference between 4K and HD? With four times the detail of high-definition telly, 4K Ultra HD is starting to become more widely available, but is it worth it?
What is 4K TV and is 4K TV really worth paying extra for? What's the difference between 4K and HD? With four times the detail of high-definition telly, 4K Ultra HD is starting to become more widely available, but is it worth it?

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