For most video shooters, one of the first creative prime lenses to dive into would be a 50mm. It offers nice framing, good focal distance (not too wide not too far), and typically these lenses are accompanied by a a wide aperture for that super shallow DOF 'depth of field' look.
Until now Samyang has left this lens out of their product lineup, but today they've finally made available the 50mm T/1.5 Cine Lens for Canon, Nikon, Sony, and Micro Four-Third cameras. You can find more information about the new Samyang 50mm T/1.5 Cine Lenses at B&H (here)
The 50mm T1.5 AS UMC Cine Lens from Samyang is a fast manual focus prime lens. It provides a maximum aperture of T1.5 for effective low light capture and shallow depth of field control and an 8 blade iris for attractive bokeh. Optimized for cinema and video applications, the focus and aperture control rings are outfitted with industry standard gearing, which provides an interface for working with a traditional follow focus. The aperture control ring has also been de-clicked, which enables smooth iris pulls. In addition, bright aperture and distance markings are printed on the lens barrel facing laterally to facilitate easier control by a focus puller.