will it work better or have any benefits after upgrating the firmware or what?

This what you'll get with the upgrade.

1: The product will be "Certified for Windows Vista"

2: Support for the new USB Media Transfer Protocol (MTP) has been added. The PTP option in the setup menu will be modified to MTP/PTP. The icon will also be modified.

3: The effects of noise reduction processing performed at shutter speeds of 1 – 8s with shutter speed set to "bulb", when ON is selected for Long Exp. NR in the shooting menu, have been improved.