It holds up perfect on the pappas chart of death, and all my bright exterior foliage scenes. I think that 12 gop seems to be the cure along with many other settings that I'm not sure of how they relate. I have played with several gop versions from 6-1 and they do offer a slightly better quality but they are not as stable on high detail scenes, and have problems importing into avid.
Low light looks excellent so far, I was able to file span twice indoors, will test more tomorrow. LL bitrate between 24 and 33, with nicely balanced image.
I don't know how you save these zip files but as a mac user I can't see them. Please list your stable settings I'm very interested in using them. Thanks for the work.