matches the m43 sensor while in video the sony is clearly superior.
Is there any aspect where the GH4 worth ~2x the investment? Alright, I won't be able to shoot 10+min 4k with the RX, because it overheats.
Also I won't be able to use a true fisheye, I have to live with the ~120° provided by the WWL-1. Anything apart from that?