How does UCT compare? Without current data in front of me, hard to say authoritatively, but the last figures I saw still showed the upper echelons to be dominated by men, while the lowest in-sourced workers tend to be a mix of DAs (traditionally more manual, and more male) and bottom-end clerical (traditionally more female). Outsource workers - the real bottom end wage-wise - are female-dominated across cleaning and catering, and male-dominated across security and grounds. But if one generalises, it's still pretty accurate to say top earners are disproportionately male, bottom earners disproportionately female.
And on the "equal pay for equal work" question? Well, with RFJ for staff on academic conditions, those disparities have largely become issues of rank / promotion, but staff on other conditions have the differential of "performance-based" positioning within a payclass. Data from a few years back showed males typically earning more than females - across job title, payclass, or area. Males in similar positions more likely to be on a higher payclass than females. The kind of trends one finds everywhere, in other words.
How much of that has been addressed in the interim, with the factoring of "performance" into the equation? Hard to know, without access to the data. And, of course, if one factors in other dimensions like race, how much more interesting a picture would it paint?