you mention the camera is half the price of the Epic - which is incorrect... The F55 which is '4k' ready is $50,000. Epic is about be significantly dropped from $25,000. The F5 may be $15,000, but you'll need to spend another 10k for an external recorder in order for it to be '4k' ready.
funny how people get excited about 4k now- no one's even seen any images from either of these cameras, expect them to be as disappointing as the F65.