Before I start answering your question I just have to ask if you've looked into the requirements to immigrate/work in Australia. It is somewhat difficult to get in and you have to have a profession/trade that they want.
As far as living here goes it's been great for us so far. I would say the biggest downside is the cost of living, however just like Canada there are expensive places and cheaper places. So it really all depends on where you want to go. If you want big city living, or a suburb of one it will be more expensive. If you are about farther away from the big cities then you can have more reasonable housing prices.
We left from Fort McMurray and moved to an outer suburb of Brisbane. We found the housing prices to be about the same or a bit cheaper here. However if we were right in the city it would have been a lot more expensive, but we didn't want to live there anyways! We actually got a lot nicer house here, for cheaper, than we did in Fort McMurray. But then Fort McMurray is very expensive even by Canadian standards.
Health care is a bit different. If you are permanent residents here you do get free healthcare (Medicare). You generally have to pay for doctors appointments out of your pocket though and then Medicare will reimburse you for a portion of it. It costs be about $20 out of pocket after it's taken care of. You can find a doctor who bulk bills (you pay nothing) but they are hard to find and have longer waiting lists to get in. So I personally don't mind paying the $20 to get an appointment. I can get in rather quickly and don't have to wait hours once I'm there.
Medicare generally covers hospital expenses, doctors appointment (most or all of it), blood tests, ultrasounds, CT's, etc. My daughter stayed overnight at the public hospital and we weren't charged a thing.
There is also private health care, so it is a two tier system here. If you earn over $140,000 (I think that's the amount now) as a couple then you might as well take out private health care or they will tax you. If you earn under that then it's up to you whether it's worth it or not. We have private health care (because of the income cap) and we haven't used it at all. Sometimes with private care you could still end up paying a fair bit out of pocket. for example you choose to stay in a private hospital. The hospital will bill Medicare for the fees and then they will pay their portion, then your private health care pays a portion and whatever is left over you are stuck paying. If you go public then I would generally say there are no fees at all.
The education system I can't comment on too much because my kids are not quite in school yet. I think it's fairly comparable to Canada though. There are a lot more private schools here though so it's a lot more common to have that choice when sending kids to school. The state schools (public) are free although they do generally have some expenses. Like uniforms, they all have them and can range from cheap to expensive. My daughters uniform for kindergarten next year is $120 for 3 shirts, shorts and a hat. I'd say that's about average or possibly on the cheap side. But then you don't have to buy as many clothes for them so it sort of evens out. There can also be textbook fees, voluntary contributions, etc. So I think there may be a bit more out of pocket expenses than in Canada. But personally I don't mind. I like the idea of uniforms and of having textbooks in pretty good condition (unlike some that I had to use in school!).
I've already mentioned housing costs. Really that depends on what you want though. I'd say on average it's probably more expensive. If you're coming from Toronto though you may or not find it so bad. You'd really have to look up the real estate for whatever city you're planning on going to.
http://www.realestate.com.au
There's also a tab on there for renting, which is generally a bit cheaper. Mostly due to how they view investment properties here and negative gearing (using a loss on the rental to offset income).
Mortgages would be about the same process and system as Canada although the interest rate is a lot higher. Our mortgage is at about 8.16% at the moment, so a lot more than Canada. The one good thing is that they have offset accounts here. If you have one whatever money you have in your bank account will offset that amount from your mortgage. So if you keep $20,000 in your account then $20,000 from your mortgage will not earn interest (which means you don't earn interest on your regular account though). But it's worth it because it essentially means that your regular bank account earns aabout 8.16% interest which is great!
As far as every day things go I find groceries to be similar or a bit more expensive. Fast food seems a bit more expensive, but then the dollar is less here. Restaurants on appearance seem more expensive but the
taxes are included in the cost (as with everything here) and there really is no tipping. So it works out about the same to Canada. Now that I think about it most things are similar to Canada except the tax is built into the price rather than tacked on at the end like in Canada.
The only things that have really struck me as being expensive is electronics. Our TV was a bit more than we would have paid in Canada and computers seemed expensive too. White goods also seemed expensive. Other than that things seem pretty similar. Used vehicles tend to hold their value about the same as Canada as well.
Employment has been good for us, that's a big reason why we came. My husband is a mining engineer and they are in heavy demand here, so he's had no problems with work. I can't speak for other professions though. Some people in trades have difficulty getting their qualifications recognized, but if you have business degrees then I don't think you'll see a problem that way.
If you are planning on trying to find work before you leave be aware that it is VERY difficult to obtain work before you leave. Partly because they really don't look at people from out of the country. Possibly because they might think you don't have a visa, or beause you're seem as too expensive to bring over or there might be problems (like house to sell, etc). So generally you'll have to arrive before you can really get anywhere with the job hunting. My husband tried to find a job before we left but it was just about impossible. Once he arrived though they were all over him. Some people are lucky enough to get jobs, but it depends on your job and whether they can fill the positions within the country or not.
On the whole I would say that we love it here. I would gladly stay for as long as we could. But when we came over we had decided that we were only going to stay for about 3-5 years tops. So we've always known we would be going back. But, as I said I would happily stay here. Mostly we'll be moving back to be near family for a change, and also because we know that if we move close to family that we will be able to buy a house mortgage free. Plus, we've always liked Canada so weren't exactly moving to get away.
But I do like it here. The Aussies are very friendly people, and on the whole life is pretty good. Mind you my husband has a job that pays very well and financially there are no issues, so that helps.