Interesting, I was in the CX business lounge at the end of august, and thought it was great. The noodle and dim sum bar in particular, and moet on demand at the bar.
I'm back there at the end of November in F so hope the Qantas lounge is open to compare. I don't recall ever going to a Qantas lounge so don't really know what to expect. I'm a bit lazy so cant imagine myself going to 4 lounges to check them out, I think 2 is my max!