Some a7S owners may think the lens a little too big and heavy to use on their camera but I don’t see it as a problem. If you balance well it can be handheld even without a rig. For hand holding the lens on a a7S I put my right palm underneath the lens collar and use my fingers to operate focus, zoom and iris. With your right hand you can operate all the camera side settings.
The positive aspects of this lens far outweigh the few small drawbacks of this lens. For $2500 it offers a level of performance and a feature set that was previously unobtainable for most shooters. I highly recommend this lens if your a Sony full frame FE mount camera owner
You can see plenty of videos made with the lens on the Newsshooter review page.