According to the QF Website, yes you have access to the QF J Lounge.
International Business Qantas International Business
Next onward flight that day must be a Qantas marketed flight. (QF flight number)
One guest allowed and must be travelling with the member on the same flight. Emirates International Business
Next onward flight that day must be operated by Qantas or Emirates with an EK flight number.
One guest allowed and must be travelling with the member on the same flight.
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