It's not really a zooming thing. You just have to think differently about your lenses. The 5D has gotten people to used to full frame videography, which is not really the norm. When I had a 5DmkII, my 28mm prime functioned as my wide angle lens.
You have to change your perspective with a m4/3rds system. Now, my Panasonic 14-42 serves my wide.