Hard for me to say, as I almost exclusively fly from LHR.
I've only done ex-EU from Paris but that a Y class family trip that worked out ridiculously cheap as QR used to 'lose' YQ on European open jaws. Think that loophole has closed!
Sure others can highlight best places to check out, keep an eye on this board:
http://www.flyertalk.com/forum/premium-fare-deals-740/ as many things QR related pop up there.
Edit - there is a "CX/BA/QR: OSL Oslo - HKG Hong Kong €1396/$1567" thread for you - perfect!