Loving the G's. I also loved the G30's too, which is why I still have 'em.
Aside from the looks and maybe a few additional yards with the G's, there's not a whole lotta difference between the two imo.
That's the downside for PING, I guess. You could go back a dozen years to the G5 series back in '05, which were great irons for me, and there's not a tremendous difference in performance. They don't reinvent the wheel because they've never needed to.
But of course - we're talking more game-improvement versus player's clubs. I'm sure there's been some additional performance to go along with the cosmetics in their i-series models since then.