I don't want this to come off as an attack on anyone or turn into a flame fest. Just offering my perspective on the whole thing. In sports psychology they talk about different types of competitive mentalities. Those who compare themselves against others (by performing better) and those who compare themselves against themselves (by beating PRs). Traditionally speaking, the latter is typically the more successful athlete, but a blend between the two is also good.
Bodybuilding seems to have more of the competing with others sense. I mean it takes a pretty good perspective for someone to be self-competitive in a bodybuilding sense. But, it can definitely be done by someone who is keeping a log. If someone is just lifting entirely aesthetically without measuring much beyond body fat, its a little harder. It might also throw in the arguement that using AAS or hGH is a bit more competitive with others than self competitive.
Powerlifting or Oly Liftin is a little more open to both but in the workout room its more likely you are concerned with beating yourself than beating others. In the end you have a combo of both.
So, from a sports psychology sense the one who is more concerned with topping competitors is more of an insecure athlete than one who is more concerened with beating themselves.
Best example... if you go out and pull 400 and then go out and pull 550 but still in 10th place. One would say you haven't improved. Another would say you've improved 150 lbs. It's always better mentally to see progress.
Thats just my perspective. Not meant to say one is better than the other. I suffer from, not being bigger than anyone else, and not being very strong so, it'd take someone about 10 hours to see what I'm good at LOL.