Cast screen works perfectly between Nexus 5 or Nexus 7 and Sony 42W650A... Sometimes, the connection fails while casting but hey, it works
It is supposed to be Miracast. If you have a receiving device that supports it, it should work.
It's just another Galaxy...
+ Nexus 5 Hammerhead > Stock Rooted 4.4/TWRP
+ Nexus 7 Flo > Stock Rooted 4.4/TWRP
+ GT-I9300 > Supernexus 4.0/TWRP