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So after having my GH2 for around 2 months, I finally took the time to hack the firmware. I used CBrandin's 66mbit patch. So far it has been totally stable, and has definitely improved the quality of the 720 60p mode at 32mbits. I haven't tested the 66mbit 1080p24 yet. The footage seems to hold up much better to grading as well. The only problem is it eats up card space twice as fast.
Here's what I shot the first day after installing the hack. Everything is handheld shot with the 14-42 kit lens at 720 60p, and conformed to 24p in Cinema Tools.