Well since the Mavic is cheaper, smaller, lighter, same camera and video capabilities, same flight time, just 5mph slower, same range (7 miles) I cant see any point anybody would buy the phantom 4. In fact because the camera is mounted in a protective bubble and is forward then in some ways its better as you wont get the props in the videos when flying fast and the camera is more protected from crashes.
The only thing the phantom 4 gives you is the ability to fly in higher winds over the Mavic and a dedicated controller which you can mount an large screen ipad to it.
I'd like to see some proper videos showing movement. Panning etc etc