Canon knows lenses and with their line of cinema cameras, these servos are a great addition to your run-n-gun documentary-style of shooting. As a relatively fast lens, you only lose a little stoppage at the very end of your lens. However, the 17-120mm coverage is amazing!
It's compact, lightweight, 4K ready, and supports Super 35mm sensors. Not to mention it's 11-blade iris provides clean and pleasing bokeh. A solid lens.