4K is still a gimmick right now, much like 3D. You'd need to get into the 70 inch + range of TV's before you'd start to get any benefit out of it at regular viewing distances, with 55" you'd need to sitting a foot or two away to see any difference between 4K and 1080p. Personally I would (and did) get a cheaper non-4K TV at a much more reasonable price and wait for OLED to mature, that is the real next big step for TV technology
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