As far as I'm aware, faculty salaries are all regulated according to bargaining between the universities and their faculty unions. Within these regulations, salaries are usually fixed to a point-scheme, where time since PhD, time in active research, time spent on this and that usually counts. I find it hard to believe that a female faculty is paid less than her male counterparts given the exact same qualifications and years on the job. Of course, should she take off a year or two for mat-leave, yes, than her salary will be accordingly lower, b/c she has been absent for a while. Whether or not this is just, is a good question though.

And while we're at it; sure, science is sexist, because quite often advertisements read "women are especially encouraged to apply" - there often is biased and preferential treatment towards female colleagues - so, there is your sexism.