i really need to use that 70-200 2.8 Lens.
And with iris control of course, anybody knows if PS Technik will provide that function?

Does the P+S IMS-F3 mount give you iris control? I don't think it does. For a dumb mount you can get a F3 to Canon adapter from Adaptimax:
Adaptimax Nikon and canon to Sony PMW-EX3, Micro 4/3 Adapter for Panasonic AG-AF100 (http://www.adaptimax.com/)

Why not use a Nikon 70-200 f2.8 or other nikon fit lens. The Sigma 70-200mm f2.8 APO is a great lens and you can use either the MTF adapter or Adaptimax Plus to get iris control.

I have the 5D MKII already and a 24-70 2.8 and a 70-200 2.8
I don't wanna invest in lens for photo.