Nope sorry a colleague did the flight with Qantas, and although you were supposed to swap seats he said it was not well enforced and not everyone got equal viewing time. As you know some people can be dicks and hogged the windows with their giant cameras well beyond their fair share.
I trust his review more than a strangers and saw the photos and video he took on board, and based on that do not think it is worth the cost. As I said YMMV, we all value experiences differently, but my view did have a real basis and the value is not there for me personally.
Flying over (but not landing) is a poor substitute to actually visiting a place. Its like when people say they have visited a country but in reality have only been to the airport or driven through without stopping - that does not count imo.
FYI [USER=21582]@SYD[/USER] is not doing a dedicated Antarctica joy flight, they are just flying home from South America on a commercial flight, something I have done myself a few times, and yes if you are lucky you can get a free glimpse out the window, but given passengers no longer have control of the window shades (these are typically overridden by the crew) it is far from guaranteed, which is fine since the purpose of that flight isnt to see the southern continent but to get home from SCL. But if you pay for a joy flight you should be guaranteed viewing time and IMO you should be able to book a window seat for the whole flight.