@miguelv2002: I'd say no. There is currently no form of official 4K video. Sure youtube has a few, but there are no disk formats with 4K so no movies, not a single channel that I know of on my provider in 4K. PS4 is not in 4K for anything at the moment even though 4K video is supposed to be supported for the future.
Right now I see no real reason to even own a 4K TV, even if the price is becoming more reasonable. I'd say save some money and buy the HD TV, the price of 4K will drop and drop every year so you will likely spend less in the long run if you decide to buy a 4K TV in future when there is actually something to watch on it.
The key for me with TV is not to buy the biggest TV possible, it is to buy the smallest TV feasible. Sure most people could probably cram a 100 inch HD TV in their living room but HD at 100 inches from six feet away will look terrible. HD on a 40 inch from six feet away on the other hand looks fantastic.