So this isn't on QF, but since it's always interesting to compare other OW carriers...
After a QF SYD-DPS in J with no semblance of greeting (Platinum or otherwise) and two QR J flights with the usual multiple greetings (though no specific acknowledgement of status, not that it matters), the oddest experience was our BA LHR-BUD flight in Y yesterday.
We're a group of 3, on a single booking - I'm WP and my two traveling companions are both SG. On this flight I was seated back in row 12 in an exit seat for more legroom, and the others were in row 9. I neither expected nor received any special recognition, but the others told me that they saw one of the FAs zipping hurriedly around the forward rows of the economy cabin handing out glasses of champagne to selected people, one of whom was one of my travelling companions - just a simple "would you like a glass of champagne" and that was that.
No mention of status, nothing offered to the rest of us, and no rationale as to why him... but a gratefully received (albeit random) gesture all the same.