Hello,
Thanks to both of you for your replies. So, if I resume, MkII with ML is more user friendly in the actual state of the ML development, but once ML for MkIII will be developped, there will be a real gap for video, so MkIII is a good investment in a medium/long term perspective... If the video shooting has to starts now, it could be more accurate to choose the MkII.
So, according to my future projects (still phootgraphy and video documentary in a remote rural area, no assistant, no soundman, no extra lighting) which are no urgent, I picked the Mk3(!!!)...
B.