[quickthrower2]

I found London -> Sydney that rents were cheaper with more value for money in Sydney.

Food is a lot more expensive - but I guess if you eat cheaply or take advantage of office perks it could get the cost down.

Alcohol / going out is a lot more expensive.

Fuel / public transport is cheaper (but public transport is not as good in Sydney).

Tax is slightly less with no National Insurance to pay, and the employer is not paying it an sticking that into your Superannuation (Pension) instead.