Many of these benefits are airline specific in Oneworld -- some airlines offer it and some don't! For your specific question, QF offers it for QF Gold on QF flights (and double for Emerald, so its a bigger benefit than Star gives). About half the OW airlines have it, you'll just have to check for your specific trip routing -- these rules have changed in the past, and with the high fuel prices all the airlines have been cracking down on free luggage allowances.