So update on this. 2070 Super arrived today. Just had a 2 hour Wildlands session. Exactly the same settings as the RX 5700 XT was running at, what a difference;
FPS Avg:
2070S - 100 -110 constant
5700 XT - 60-70 (sometimes jumped up to 80)
Temp:
2070S - Maxed out at 66 Celcius
5700 XT - Sat at 77 Celcius constantly
Noise:
2070S - hardly hear the fans, I know they are there but barely
5700 XT - Sounded like a jet engine constantly.
Overall I think my choice has been justified. Much better FPS and that is on Very High @ 1440p 144Hz.
I kept having to dial back to High on the 5700 XT.
I might have been unlucky and got a faulty card, but I am loving the Gaming X 2070 Super.