I thought I'd investigate my own setup and recalibrated my monitor. Took a couple hours but it's perfect now. You're right. No magenta or blue hue in the ungraded still, and no green tones on skin in the graded image from Butch. None. The GH4 has no color issues from what I'm seeing and it looks like it might even have more dynamic range than I originally thought too. Haven't seen Nick Driftwoods footage but I will take a look. He's done so much for the GH user community and I really appreciate his work especially on the gh2 frontier. He's made some incredible settings that I've found myself using often to achieve great results.
Andrew, I agree, the GH4 is a superb value camera for what we are getting and I'm excited to see what people will create from this camera.