and depends on the flight. In my experience, opup are more frequent on flights operated by 77H but not so often on the 77G since theres more premium seats (FJW) on the 77H. I've had 3/4 PEY-J opup between HKGLHR this year, all on 77H. The 4th flight was a 77G.

But thats just in my case and my luck this year- as often discussed here, opup is not guaranteed. IMHO, one shouldn't 'expect' an upgrade, so to avoid disappointment.

ps CX GO is not that high up the opup ladder, esp between HKG-LHR, which is a DM/ DM+/ J/ F heavy flight anyway...