I don't want to be the voice of negativity; I work with physicians and nurses (and CRNAs and PAs and NPs, etc.) on a daily basis in my profession.
In general, EVERY attending physician I know tells their residents: "It doesn't get any easier when you're an attending."
He won't be earning residency salary, so finances are almost always better, but the stress is usually worse. Because as the attending, the buck stops with you, and there is no one else to take the fall for your actions. Furthermore, if he is in a private practice, he will have the stress of the business finances. If he is an employed physician, particularly if employed by a hospital system, he will have the stress of bureaucracy/red tape, infighting of organizational politics, irrational productivity targets by bean-counters, etc. All physicians have to deal with the soul-stealing effects of Meaningful Use demands, Obamacare burdens on physician (not the insurance part, but the ridiculous and irrational requirements/rules on physician practice), Medicare rules, Medicaid rules, the state licensing "flavor of the month" political trends, etc.
I think you just trade one stress for another. He might have a short honeymoon phase in the new job, but sooner or later the grind sets in.
Here's one link: What is the price of physician stress and burnout? | Medical Economics
In short, what I'm saying is that these issues and his stress may not just go away by waiting a few months for the end of residency, and you may still need to deal with them.