Hello everyone
So great news in regards to this hdr issue, after updating my ps4 pro system to the most recent version 5.00 and putting all my ps4 pro setting on automatic (including hdmi range of tv on auto) hdr is perfect on my sony tv. No more dull colours, I have tested it with multiple games nba2k18, UNCHARTED 4, injustice 2, BF1 and all look perfect. This is further verified when you press the playstation button on your controller while in game and then go back to the main dashboard it is no longer faded, the colours of the ps4 pro main menu look the same as when hdr is off. It seems this was an internal issue of the console and had nothing to do with the tv all along. Very happy though that this was fixed by Sony.