If you're not experiencing any issues, then I would not recommend updating the firmware, particularly with the same version. There aren't any added features that would be beneficial if everything works fine.
I bought the above TV in may 2009, with firmware 1013 release date December 08. I have seen firmware on samsung site release date 06 2009, however when I went to load it the TV asked to confirm replace 1013 with 1013.
My question is, is the 2009 firmware an updsate to dec 2008 or not ? Should i just upgrade it anyway ?