To visit Australia Qantas is the best airlines. I have travelled to Australia by Air India, Qantas and Thai Airways on different occasions. Though Thai Airways is considered to be one of the best airways, for us (Indians and particularly pure vegetarian Indians) Qantas was the best airlines.
It has a limited-but-available-to-everyone staff in Qantas who is at your service round the clock. Their behaviour was much better and hospitable than in Air India or Thai Airways.
While in Thai Airways and in Air India, the cabin staff will come to you once and serve the limited choices of food/drinks. Once they serve, they do not like to be called back to serve more. Whereas on Qantas Airways, you call the lady umpteen times and every time she will be at service with a large smile on her face.
The overnight journey is felt less troublesome in Qantas than in any other Airways.
Pradeep Ratnaparkhi