French salaries for postdocs and engineers in public research are fairly under average. Still we have plenty of Italians in our lab
When I was doing my postdoc ~ 7-10 years ago, I was making 1500 euros after taxes.
A relative adjustment might still mean a large absolute difference, though; I don't know about Italy and Switzerland, but even paying double for a house in Luxembourg compared to an equivalent in Portugal, and not earning double, I still had more money at the end of the month.