Canada 3000 are apparently planning YYZ and YVR to Delhi with an A-340.
Great circle from yvr is 6040nm, yyz 6309nm.
YVR to HKG is 5550 give or take and a full load of 284 pax meant max t/o weight of 275k using Macao as an alternate so I would guess that full payload may not be available. The Great Circle site gives EWR to HKG as around 7000 nm which Continental and United were/are doing so obviously the DEL route is feasable. Interesting that you can do ORD and YYZ using 180 mins etops according to the chart. I have no experience of engine out terrain clearance routings in the area of the Himalayas and I wonder if this would impact on the DEL outbound routings? Some body here must know.