In addition to all the "Ektar isn't the best portrait film" replies (adding that both of the new Portras are excellent, assuming you want to stick with Kodak), I should add that "scanning and attempting to get good skin tones off C-41 is really hard if you haven't done it before" and that I personally find Ektar much harder than other films to get good skin tones from a neg scan. So you might want to avail yourself of your lab's scanning services, at least for that one important shoot.