Have a look at Jennifer Polk’s excellent three-part series in University Affairs, which features extensive and insightful comments from six PhDs working in different fields outside of academia.
Part 1: “What’s it like to work beyond the professoriate? Six PhDs explain”
Part 2: “What’s it like to work beyond the professoriate? Part 2”
Part 3: “Salaries, benefits and performance evaluations in a non-academic work environment”