Re: salaries for ETH (or compatibles) graduates
A grad (with first class honours or equivalent) starting a PhD would be on about 2500-3000 scholarship/salary per month after tax. (I know some guys doing this)
As far as i know, a PhD in physics/electrical will get you a starting salary of between 4000 and 6000 after tax per month (13 pays/year) depending on work experience/responsibilities. I asked around, and this seems to be the norm. I know guys a fair bit more experienced then me on about 4K/mth, so i guess bargaining has a bit to do with it. I guess it depends on where you live too. ETH probably has to pay a little/lot more as a cost of living supplement for Zurich. Also, if you choose the corporate over the academic path you'll find the pays will be higher again.
Bio-tech probably just pays more, seems to be the same all over the world.