@Rafael Amador

You can stop the lens down to widen the depth of field. f/8 is way different from f/1.4, but if you have a camera where it is a deep depth of field all of the time, it really limits what you can do creatively, in my opinion.

That said, I have a GH2 and am really happy with the depth of filed control I have with fast lenses on that camera. One thing I'm really kind of blown away by, is the fact that Black Magic didn't make a micro4/3 mount for the Cinema Camera. The sensor is closer to that size, and you can adapt many many more types of lenses to m4/3 mount than to EF. That's the one point I disagree with Marco on. There are a lot of lenses you can adapt to EF, but stating "you could just about put any lens mount type on this camera" is a bit hyperbolic if you compare that mount to m4/3 or Sony E-mount, which really are adaptable to almost anything.

Plus, with m4/3 mounts, you have some reasonably priced fast wides that currently can't be used on the Cinema Camera.

I'm sure they sacrificed m4/3 so that they could actually talk to EF lenses and control aperture and auto-focus and such, through the LANC which is a really nice feature, but I'm undecided if sacrificing a plethora of good wide/fast/non-fisheye lens options was worth that trade.