I have a bunch of the original Jelco magnesium headshells (LP Gear equivalent) and have compared them to carbon fiber headshells. The CF had cleaner, better delineated bass but diminished highs with slightly less dynamics. Overall, I stuck with the magnesium.
SL-1200G/Hana ML Best Headshell
I have been looking at a Titanium and Carbon Fiber headshell. I think one is 19gm vs 12gm. The ML has published compliance and weight, but I can't find published figures for the Technics magnesium arm? Anyone have suggestions as to best way forward when looking for a headshell?