I've been running an i5 2500k since April, 2011. (currently with Nvidia 670 FTW SLI, 16GB 1,600MHz RAM, 250GB SSD, and in 2560x1440).
I'm running games fine, but I was wondering if upgrading to a newer generation of processor would benefit me a lot with heavy image processing and editing. Also, I have no experience with hyperthreading (although I know it's i7 specific). Would it make a significant difference in programs such as Photoshop and Lightroom?