The caveat with the 7-14mm is that it has no filter thread, so no easy way to mount NDs etc to control your manual exposure. The Oly 9-18mm does have a filter thread (and is half the cost).
The 7-14mm Aspherical is really fun for shooting video. Panning and tilting become whole new experiences because of the unusual field of view. I enjoyed shooting indoors because the lens shows so much of the surrounding walls. While testing the camera and lens, I found myself triple-checking to see if my lightstands or mics were in the shot