Seeing differences at origin/branch?

Hello all,

This is perhaps going to seem like a very CVS/SVN type of question,
but is there a way to see a list of differences between one's local
copy and the origin branch?  I'm after something analogous to "svn
status -u" really (yes, I know I could get my hands scorched for such
things.  :P).  Is this possible?

I've tried:

git-diff-tree -p origin/master

But that won't list changes waiting for me that I would get when I
issue a "git pull".

Many thanks,

Thomas Adam