was on last week flight to HKG, upgraded for free from economy to business for me and partner. (bought them for 300 euro when on sales), the flight was full.
on return, upgraded to plus as well, free.
on our flight to Taipei with Cathay/return with Dragon, both segment also upgraded to business for free.
1 thing I find interesting is, fight attendant (purser) on OneWorld always come to said Hi and introduce themselves to you.
a lucky trip