I worked under one in South Africa and he was genuinely passionate about project management: he was constantly in courses, constantly researching and constantly asking for feedback.

One of the teams I oversee now in NA also has a brilliant project manager. Of all my 12 years in the industry I haven't once seen someone pull a team into productivity nirvana like she does. She deeply understands the concept of agile and every sprint she is trying a new idea with her team (process is a feature!).

They do exist, but they are rare.