I am but a VA Gold (Platinum after this trip) but I can relay my experiences of Economy later next week.
VA Gold;
SYD-AUH
Started the trip in MEL - had to wait about 25 minutes for the transfer bus at the VA transfer desk. Just wasting lounge time

.
Received an express pass at MEL check-in. Not sure why I used it!
On-board: No special treatment, except for a welcome back at the door.
Very light load, had a row of 4 to myself. Loved it.
AUH
Al-Reem lounge. Kinda small but oddly adequate for what it is. The scrambled eggs were absolutely delicious!
AUH-LHR
Priority boarding saved a fair queue. This was the *only* flight where I received any "special" treatment. The F/A came to me after take off to introduce herself, check how to pronounce my name (fair...) and asked what I wanted to eat, so to be sure I got my first choice. This was really appreciated.
VA Platinum;
LHR
No queue at check-in. Though my boarding passes predictably still showed my as Gold. I tried to get the check-in agent to remove my number and re-add, to trigger a re-query from Sabre after I said I was a Platinum now. But I may as well have asked her to suck an egg. Decided I would treat it as a research to see if experiences matched to the outbound trip.
I also asked to try and move up the front, as I wanted to be out of the A380 quickly and to security, to maximise F lounge time. Apparently there was nothing available at all. But "try on board to go up to row 45-48". Haha. A premium experience this was not.
Lounge was fine, busy and probably not as nice as the SYD one, but fine.
LHR-AUH
Priority boarding worked great, skipped a massive line. On board, nothing special at all. Had my choice of meal along with everyone else. I was in one of the rear most rows and it was completely full.
AUH
Had to wait for almost an entire A380 load to disembark before I could. F lounge time slipping away! And I had a short transit. Security was a zoo, but for the first time I've seen at AUH the premium line was manned. The lady tried to direct me to the long queue (reading a book by its cover presumably) but let me through on presentation of Gold BP.
F Lounge I expected to have a back and forth about my status. But thankfully it was very easy, just asked for my card, I offered my digital one (as obviously I didn't have the physical one) and was in 2 minutes later. Sat down to a quick dinner of pumpkin soup and tandoori lamb. Delicious. And great service.
AUH-PER
Middle seat vacant, nice win. Didn't want to eat, but thought to see what the experience would be. Oh boy....
Served amongst the last, and had no choice of meals. Just a "I have fish for dinner for you sir" and put the tray down. Dear me...
Rest of the flight uneventful.
Sorry didn't expect this to be so long, mini-TR of sorts! Anyway, hope it helps someone out.