It gets a fairly poor rating by FlightStats.
Over the past month, ex-DFW, ~70% on-time, 9% late/very late, and 18% excessively late. Average delay is over 2 hours.
Basically, either it's fine, or you're screwed (i.e., major MX).
http://www.flightstats.com/go/Flight...irportCode=HKG
For the ex-HKG flight, 86% on-time, but the severe delays are worse (avg ~3 hrs).
I do wonder how this will shake out when they're rotating the aircraft through DFW/HKG/LAX with little slack built into the system. It might get ugly.