[Guy McLoughlin]"To use a 2/3" lens you will need something like the AbelCine HDx2 B4/PL Optical Adapter which doubles the focal-length and enables the lens to fully cover the much bigger m4/3 sensor."
Guy, many of these Betacam lenses have "duplicator".
I don't know much, but a 2/3 lens is a 2/3 lens for HD and for SD. The difference may be that in the SD the lens is framed for 4x3 and in the HD for 16x9.
The thing is to know if with the same adapter those lenses would work.
HD lenses are great but too expensive.
Don't know if I'm saying a "bêtise".