One of the hottest lenses right now for anyone switching over to the Sony is the newly announced SLR Magic 50mm F/1.1 Cine Prime Lens. It's said to be shipping in about two weeks for just $349. Covers Full-Frame Sensors with a geared Focus and clickless Iris Ring. F/1.1 is a pretty wide aperture and this also lens sports a 13 blade iris. Canon's 50mm F/1.4 I believe only has an 8 blade iris.
Every video shooters bag should have a good solid 50mm, and this one is far better for video use than an autofocus lens from Canon or Sony. Even cheaper (and most likely better designed) than a Rokinon 50mm. This looks like a winner in my book, but unfortunately only available in Sony E-Mount. Preorder now (link).
SLR Magic 50mm F/1.1 Cine Prime Lens for Sony E Mount