Thanks to both of you. What Guy posted was acutally was I was searching for, but Ricardo's tip is great also. I am currently discussing with the director which path we go. As money is basically not available I just tried the VFX route which seems to be quite convincing.

Thanks guys! I think I will go both ways :-)

And if not, is there anything else you would recommend like it?

Include Waveforms and you got an instant buyer. Even as a paid firmware update.

If you want some wides, try the Pana 14mm 2.5
Its not ideal for focusing but hey, its 14mm!

"What I was referring to was NOT the ISO bug, but rather that the image from the GH2 sensor falls apart once you go higher than 800 ISO. " - Yes, I know that! Did write it clearly obviously. Thanks for the tip.
Okay, so I am going to practice some more for the shoot ;-)