Only if you are flying on a CX flight. You need to check-in at the desk for the airline you are flying. As a OneWorld Emerald member you can use the First Class check-in for the OneWorld airline you are flying.
As others have noted yes for a CX flight. Used this on Tuesday at HKG and was very impressed.
They are essentially desks and the attendant does the check in while another person prepares your bag.
As I walked up to the desk, a CX man approached me, I showed my WP card was warmly welcomed. All in all a very pleasant experience and priority baggage tags really work here.
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