Sony PMW-300 is the replacement for the Sony PMW-EX3. This camera is design to suit ENG (Electronic News Gathering) and multi camera situation which incorporate an integrated view finder and a shoulder support.
The 1/2″ sensor has been a success since the Sony PMW-EX1. The PMW-300 lens is interchangeable which set itself apart from the Sony PMW-200. The 4:2:2 color at 50MBPS beats the Sony PMW-EX3 in terms of image quality. However, you can shoot on the Sony PMW-EX3 format to match your footage if there is a need.
Camwerkz Pte Ltd provides rental for the Sony PMW-300 as an upgrade for the Sony PMW-EX3.