One is based on video camera, and the other on film. Neither of the systems uses optical technology to modify the geometry of the stored image. This modification is done electronically. The signal sent to the recorder is no different electronically than the image sent by a non-widescreen camera. In fact, most of the widescreen cameras available today are switchable between 4x3 and 16x9.
Film producers have several choices.
One could capture the geometrically altered image on film with anamorphic lenses and transfer that directly to videotape. The equipment for doing this is only practically available for 35mm production and has inherent limitations. If Super 16mm production is used, things get easier. This is the scene as the Super 16 camera photographed it. It is a 15x9 image.