[Steven Dempsey]

The main differences are going to be in the sharpness, the color contrast and how the bokeh renders.

You will also notice that lenses that are made for motion pictures will have much less breathing when doing a rack focus. The picture shifts significantly when using regular still lenses…not a huge deal if you are not racking much.

In general, particularly for the purpose of shooting moving pictures, motion picture lenses such as Cooke or Zeiss will yield much higher quality results…more even sharpness across the frame, much richer color contrast and, depending on the number of blades in the lens, much more pleasing bokeh.