Should I get a 1080p TV or a 4K TV for gaming?

[UltimateGamer1982]

I've had my 1080p Samsung for about 5 years now but 4K has really become affordable recently with many sets under $1,000.

If ps4k is real, I'll definitely get one for 4K movie playback.

http://www.bestbuy.com/site/samsung-48-class-47-6-diag--led-2160p-smart-4k-ultra-hd-tv-black/9481052.p?id=1219704425044&skuId=9481052