Svn Log still shows result even after update of WC

Svn Log still shows result even after update of WC

Subversion(svn.exe) I have made a svn commit. Performed the Svn update on
my working copy. Now I perform :
$svn log -r HEAD
r14478 | Paul, Ajo | 2013-09-02 21:36:04 +0530 (Mon, 02 Sep 2013) | 1 line
dummy checking 2
Even $svn log -r 14478 gives me the same output.
My expectation was after I had performed an svn up on the WC, when I run
svn log, I should not see any more changes. Am I doing it wrong? Basically
I was using 'svn log -r HEAD' as a way to check if the working copy is
older than URL copy. The result will be parsed in an ant script.
This is my first question, so pardon me if I have broken any rules.