I, like everyone else saw the Sony A7S videos, and was completely blown away. While it is superb strategy for Sony to COMPLETELY handicap the camera, despite its insane potential. I believe Sony will introduce this sensor in its 'F' range as well as 'FS' range of cameras, which will see its full potential. While the GH4 sensor is nowhere in the league of the A7S's, Panasonic has not purposely handicap its potential to 1/10th, to make way for its professional range, which is both respectable, as well as sensible. Right now, the A7S is something that could have killed the entire 'C' range of Canon (C100, C300 and C500), as well as many other cameras which use the small form factor.
I am quite unsure of why this ridiculously unfriendly anti-workflow monster has been created. I think Sony needs to seriously re-consider undoing the handicaps.