@Marker
This is, according my understanding, certainly true for the brake performance and, most likely, for "standard" 2.1% (2 ENG) App Climb requirement. However, this might not be true if you depart VHHH and have a 7.1% requirement for the approach. That is, why you would have an Engine Out SID for a TO from this runway.
On the B777 there is an MEL for inop Fuel Jettison where you have to calculate the Missed Approach Gradient at your TO weight minus 2'450kgs for a quick return.
BTW the link for said article is here:
http://www.boeing.com/commercial/aer...icle_03_1.html