All of the above is correct.
As BA Gold the two OWE lounges you have access to are the Cathay Pier F lounge and the Wing F lounge. The Pier is generally accepted as the better one, with a sit down restaurant, good shower cubicles, foot massages are available if you can get one, and there is a tended bar. However, it is at one end of the terminal and is unlikely to be close to the gates Qantas uses, which are closer to the main terminal building. Still if you have time, it is no more than a leisurely 15-20 minute walk back to the main terminal area. The Wing F lounge is right at the main terminal area, it has a sit down restaurant with a slimmer choice than the Pier, but a buffet. It's main feature is the cabanas, which are private bathrooms with a bath and a walk in shower, that you can book when you get there for a maximum of 90 minutes. There is still a tended bar and it is a pleasant place, but tends to get a bit more crowded than the Pier because it is literally right beside the entrance from immigration/security for people coming from Hong Kong. It is close to the gates Qantas uses. The Qantas lounge is not a First lounge, but is pretty good, excellent showers, tended bar, and although most of the food is a buffet, there is also a dish of the day and dim sum carts circulate at peak times with hot snacks. The only other good point is that the Qantas lounge will have announcements for the Qantas flights if you want to be sure of when to board, the Cathay lounges do not announce flights except for Cathay ones if there is a serious delay. Of course, you are welcome to try all three lounges (and the Cathay business lounges if you are keen)