Recently flew BKK-HKG on a CX ticket on a 4-class 773, ticketed in coach with Emerald status. Checked loads a few days before departure and coach was no longer bookable, which made me hope for an op-up. At airport check-in, was upgraded to premium economy and then at boarding, upgraded again to business. Better than I had hoped and enjoyed the short ride. This was my 2nd op-up on about 10 short-haul CX segments in the past year. Certainly willing to pay more for CX on this route to access the lounges and the occasional up is another perk.