FR66s vs Ikeda IT-407 CR tonearms


Has anyone compared the FR66s to the newer Ikeda IT-407 CR1 tonearm? Any thoughts? In previous years, the Ikeda was available with either copper or silver internal wiring but the recent models don't mention anything about the tonearm wiring. Can anyone comment what type of wiring is used in the latest editions? It would seem intuitive that the later Ikeda IT407 should be a better performer than the FR66s having improved material and bearings over the FR66s but the proof is in the hearing.
ddriveman
@maxgh
IT345 CR-1 handles in my system pretty much exactly as the IT407 - I don't think it's any less effective mass than the 20g of the original 407 despite the longer length - that may be the chrome finish or some other aspect.
@chakster
FR64S





Anyone knows the real effective mass of FR-66s? I found different infos 25, 30, 35g.
Ikeda it 407 has an effective mass of 35-40g, the 345 a little less maybe 30-35g. That comes from the source. 
I think one reason for the differing mass data for the fr66s and other tonearms too is the dependence of effective mass upon headshell weight. Even FR headshells vary from one to another type. So if you use a much lighter non-FR headshell the effective mass can be lower than the lowest number quoted. Etc.