I've asked for upgrades at Cathay and never got in trouble. Haven't got any but thats besides the point.
Also the new policy is that if economy is full they will upgrade staff over full fare passengers. Sounds kind hearted of Cathay but it's to encourage full fare pax to pay for an upgrade as so many were coming to expect it, especially the frequent flying card holders.
Just for info every time I have traveled out of Australia on ID with QANTAS( only twice ) I have been upgraded on board when I mentioned to the crew I was Cathay staff. How's that for looking after your employees.