I'm not talking about comparing yourself to others as far as money or status. I'm talking simply on an individual level. For example, if you're a programmer you might compare yourself to John Carmack, Linus Torvalds, etc. Even on a more realistic level, a new/jr programmer might compare himself to the senior person in his group and think "Wow, I'll never be that good".

I totally agree with "If I don't make things as good as I can, why do them at all?" as I've thought along the same lines.