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Just a little copy paste from wiki for your records:
"4K has become the common consumer friendly name for UHDTV but technically it is not 4K. Consumer 4K resolution of 3840 x 2160 (at a 16:9, or 1.78:1 aspect ratio) differs from the industry standard of 4096 x 2160 (at a 1.9:1 aspect ratio)."
So basicaly 4K is the cinema resolution (of movies with this resolution, of course), not your TV screen resolution. The correct word is UHD for Ultra Hight Definition.
Even if Sony kept the "4K" as a marketing thing I think they are in the obligation to call it "4K UHD" because it is not exactely 4k.
(it's a bit the same with 2k and HD, by the way)
"4K has become the common consumer friendly name for UHDTV but technically it is not 4K. Consumer 4K resolution of 3840 x 2160 (at a 16:9, or 1.78:1 aspect ratio) differs from the industry standard of 4096 x 2160 (at a 1.9:1 aspect ratio)."
So basicaly 4K is the cinema resolution (of movies with this resolution, of course), not your TV screen resolution. The correct word is UHD for Ultra Hight Definition.
Even if Sony kept the "4K" as a marketing thing I think they are in the obligation to call it "4K UHD" because it is not exactely 4k.
(it's a bit the same with 2k and HD, by the way)