I have the fresnels on my 200-C's and they do not give me the same results as Arri tungsten fresnels(i.e: 300 or 650). Honestly the results I've gotten trying to cut with the fresnel/barndoors are not much better than with the open face reflector/barndoors on my 100-C's. In other words, no hard cut, just more or less "soft flagging" of the light.
This is good info to know R&G... I've been considering selling one of my 100's and getting a 200 instead for the extra output... but not sure. Have you tried your 200 with a Leko attachment ( mini or other) instead of the fresnel?