CX BC seats aren't all that nice for long overnight trips. With your trip, I think FC would be a lot more comofrtable, even if HKG-DEL may be in BC/EC-only a/c.

You might want to check if you can get a free connection to YVR and take CX 839 (leaves YVR mid-afternoon and gets into HKG early evening). Drawback is that the a/c are A340s which may not have the new FC.