Head to head Lav action.
I just picked up the Sanken COS-11D lav mic from DVCreator's DVStore. I tested it against the Sennheiser ME-2 lav that comes with the G2 & G3 wireless packages. I found the COS-11D to be much more sensitive and open sounding.
I put both on simultaneously and used a G2 unit with the ME-2 and a G3 Unit wit the COS-11D. I adjusted the level so that they are at the same level. No processing on the audio.