Limited observation here.
The anesthesiologists I've met seem to be relatively laid-back. Most of them have quite a few interesting hobbies outside of medicine, and enjoy playing the stock market. With that said, I think you need to be a laid-back, cerebral type of person b/c you need a cool head when things go bad, b/c they typically go bad fast... real fast. Being cool under pressure is definitely a plus if you wanna do something where your patients may be teetering on the edge of crumping, so the dudes I've met tend to follow above desription.