It depends, i would say kind-off. I would lie if i said i didn't want to upgrade, but i know i don't have to in a few years at-least (10-50% cpu usage whilst playing games and editing videos in Sony vegas or Adobe after effects.)
As i said earlier most changes in the cpu's is power efficiency, yes there is some bumps here and there but not that get's used that much. (better onboard graphics and such)