I think this is why I think it's ridiculous to use a character's so-called stats in d20 to discuss how powerful he/she might actually be in terms of (for lack of a better word) "real" Star Wars universe.
By the end of KOTOR I, my entire party was level 20. But I think it's absurd to suggest that characters such as Juhani or Jolee are more powerful than Darth Vader just because the d20 system may indicate it.
I realize that my reply doesn't really provide a better way to compare a character's strength to another character, but either way, I do think that comparing their d20 stats is NOT the way. IMO, it's apples and oranges. Unless, of course, someone actually wants to argue that Jolee and Juhani could wipe the floor with Darth Vader and give the Emperor and Yoda a run for his money.