I fell for it any have just purchased a second hand GF670 (why when I am a Mamiya 7 owner?). 1) It was in mint condition, seller needed the cash and has (he said) put 1 film through it (maybe/maybe not). It was also at a good price (50% of new) complete with strap, case (mint) and hood (unused).
Initial impressions: bright finder, very fine clear frame lines. Smooooth focusing, click stops on aperture ring great - better than any autofocus Nikon lens, half way between Zeiss ZM and VC 35mm lens (made in the same factory). 6X6 and 6x7 selector can be changed with finger nail, no need for a coin. Front standard more solid than I expected from the reviews I have read. focuses to 0.9m rather than 1m on the Mamiya 7 (BIG DEAL, but good - would have liked 0.7m if possible
Final remark, the lens hood is really TINY!
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