Panasonic just released a new firmware update (Donwload link here) for the brand new Nocticron lens. It improves the “motion picture quality under high sensitivity in use with GH4.“.
You can buy the lens at Amazon US (Click here), Adorama (Click here) and BHphoto (Click here). In UK at Wexphotographic (Click here). In Germany at Redcoon (Click here), Technikdirekt (Click here).