Of course the GH3/4 are not in the same ballpark--but in terms of image quality, they're about where you'd slot this one (what you lose in sensor size you get back in sensor density, at least in the general case). 300FPS is cool if you need it, but that's a pretty rare thing--image quality's a constant need.
The Axiom camera doesn't appear to be in the same ballpark as those other cine cameras, either, which is the disjoint in here for me. It's trying to make its bones on being "hackable" instead of "a great camera". I'm not sure there's that middle ground, unless it happens to come in significantly cheaper than the BlackMagic stuff (which is my next upgrade, they're fantastic).
Well you're dismissing things like on the fly color correction, when pre-grading is an important feature for a lot of productions. High FPS is also not a rare requirement. Sports/Action/explosions/water splashing/hair commercials/etc/etc all benefit from high FPS capture. These are all features that the competition advertises. Things like high dynamic range, a file format that allows for easier post production, etc are real tantgible benefits that they give you. I'm not quite understanding where you're coming from.
The Axiom camera doesn't appear to be in the same ballpark as those other cine cameras, either, which is the disjoint in here for me. It's trying to make its bones on being "hackable" instead of "a great camera". I'm not sure there's that middle ground, unless it happens to come in significantly cheaper than the BlackMagic stuff (which is my next upgrade, they're fantastic).