by Davo Smith.
The best way to check would be to either do:
git diff MOODLE_24_STABLE..MY_BRANCH
# this will show all the changes from 2.4 => your custom branch
or
gitk MOODLE_24_STABLE..MYBRANCH
# this will show all the commits that are part of your branch, but not in 2.4
(assuming you have gitk installed, and if you don't, you should install it).
If you are working with github, you can also use that to get a nice comparison between the two branches.