Mosschops30 we have lived in Sydney as dh is Australian.
I don't remember smoking being allowed in restaurants, can't comment too much on pubs as pubs over there were a pale comparison to what we would call a pub. Most brightly lit and full of pool tables and gambling machines.
In Sydney there are more imigrants than you would ever see in the UK, not that I found it a problem (but at one stage working in a recruitment company approx 90% of job applicants could not speak english very well).
There were no NHS dentists even for children.
Taxes were higher than the UK and pay was definitely lower.
Housing in the very outer suburbs was affordable but near the city it would compete with London prices easily also transport is not a good so a lot more driving is required.
My sil says she will need to move because of local schools and just like London most feel the need for private education to get the best education. She also paid privately to have her children (more subsided through work than here) and MIL was recently diagnosed with breast cancer she also felt she had to pay for treatment quickly and has got into a fair bit of debt over it.
So I would say don't go to OZ expecting everything to be better as in a lot of cases it is comparable. Of course it depends where in OZ you are actually going to live and what your jobs are etc.
We did visit at Christmas and ds1 was so happy there I for the first time felt maybe it was a better place to bring up children, but I don't think we could afford to live where I would like to live there even though dh has a well paid job and we have a house in London.
On the whole I have to agree standard of living is relative to how much you earn and the type of things that make you happy. My only real gripe about the UK is the diabolical education system here. I personally prefer living here but would move to OZ if it was best for the whole family.