Andrew, thanks for the response. With all due respect, you say that I'm coming from the wrong perspective. When you started talking about PL mounts, I thought a professional perspective was not out of line. Eitherway, you do have a good point about the limited PL options with EF. But you can get decent cine style glass with EF mount these days. And I agree, all BMC cameras dropped the ball with audio.
Regarding 4:2:2, you're right, most prosumers won't care. I was hoping for pro specs in prosumer clothes. A few on this forum say broadcasters don't care. Perhaps in their experience. I've shot mostly doc, commercial and episodic, no "live at five" news, and at least half the channels (in the US) are quite specific about color sampling standards (with deliverables), some seem not to care at all (VH1, A&E). But if they didn't, I do for the sake of IQ and grading.
All that said, I'm hoping the IQ of GH4 is so overwhelmingly good, that it'll get a hall pass. I'm truly on the fence for buying one and if so most likely with a Speedbooster. If you have any inside info about the ISO, what is its threshold before the noise is noticeable? This is one of the specs that prompted me to ditch my Gh3.