Dear Lucy25: I owned the MC2 Gold ( btw, the M.Fremer Allaerts MC2 sample in his review was my cartridge that I borrowed to him because Allaerts never had on hand a sample for review. ) and own the Formula 1.
I ow, owned or heard in my system all the cartridges you mentioned but the ZYX Diamond and my experiences, with out been the same, were around yours.
+++++ " I think best matching for the Formula1 is an active preamp.... " +++++
here I certainly agree, MC2 and Formula 1 needs an active high gain phonolinepreamp to permit that the cartridges can shows you at its best. Speaker/amps is a different matter and IMHO not related with what the cartridges can shows, of course that at this quality performance level we have to have first rate audio items at each audio link in the system chain.
Regards and enjoy the music,
R.