Looks like it is the same sensor as the 6300, just new bells and whistles.
But with 5-axis image stabilization.
It depends not just on the camera resolution.
The Sigma is perfect for the GH4 with speedbooster!
The only down point is the limited zoom range.
Also try the 50-100mm Sigma that lens is great as well!
Organic filmic look?
Sounds like voodoo marketing to me!
It is a nice and flexible cam for the price especially with the log format that was recently added by JVC. But something like the FS5 is in another league.
Hmmm, it is working now, perhaps the speedbooster needed time to register the lens.