CX standby question

Hi Guys,

I have a question for anyone who works for CX or has flown CX standby before. Does anyone know how standbys are acommodated on CX ? I've done some reading around the internet and I understand that its strictly economy seating usually, which is cool. But if economy is full, will CX bump up regular passengers to lets say for example premium economy to free up seats in economy to get standbys on type of thing? or will they just say sorry economy is full, you are SoL as a standby ?

Please share your experiences, thanks :)

Not sure what they will do if coach is full but remember they are very strict with carry on size/weight