Bogomil Roussev

Hello, I am actually a new member. We have production house and we start shooting a series. The main producer wants to buy new camera and i am making a small research. I compared red 4k to Cinealta and i can not understand why Sony /HD/ is more expensive than Red /4k!/? I think you will ask what is the final product? And the answer is: HDTV So can you help me what to choose for our production? Thanks in advance ;)