Same experience:
F-Tags come out super fast
J-Tags well... lets just say from HKG everyone seems to have at least MPC-Silver, literally every bag I saw some out after the flight was "Priority"
Agent did tag my bag First Class once when I was flying in Y because the flight was delayed and I had a tight connection. It did come out as one of the first bags. Sadly my flight was further delayed and I didn't make the connection anyway.