Are they even really competing with Sony? It's not like you have the choice of going Rift or Morpheus on PS4. If you have a PC, you're not going to buy a Morpheus for it. Their competition is the Vive, and you can expect around the same price point if not higher on that front.
I'm going to bet it won't be long before people figure out a way to get the Morpheus working on a PC since PC is so open. At that point Morpheus would be the best VR headset as it would work on both PS4 and PC.