I believe I read over on the YSSY message board that only two 743's have dreamtime seats, while the other two have only had the avionics upgrades. I came back from PER a few weeks ago in a non upgraded 743 so that's at least one. I can't remember which "dreaming" plane this was but I see it operate the Honolulu and NZ flights so that takes care of one non upgraded, but I wonder what runs the other one is used on, Manilla perhaps? However with Mumbai coming back with a 743 I guess that increases the chances of getting an old J seat on any 743 run.

A bit more can be found here:
http://www.vpmag.com/yssy/viewtopic.php?t=7580

and here:
http://www.vpmag.com/yssy/viewtopic.php?t=5796