Listing commits that are _exclusively_ available on a given branch

Hi,

I'm trying to figure out how to list commits on a given branch that are not available on any other branch, i.e. the commits that are exclusive to my branch.

So far I only have this somewhat brute-force alternative:

  git rev-list refs/heads/mybranch --not $(git show-ref --heads | grep
-v refs/heads/mybranch)

Is it possible to phrase this query in a simpler manner? Preferably by not having to list all refs and then run grep on it...

(I've already tried playing around with "git show-branch" and its options, but to no avail.)

Have fun! :)

...Johan