A billet clutch hub would definitely be better/lighter/stronger, even better still if you can pick up a cheap slipper. The difference to the standard clutch vs slipper is like night and day.
The only thing I can see from your pic that is lightened is the clutch basket, looks like an alloy one which may or may not have been standard anyway (depends on year/model).
Another easy lightening mod to free up some ponies is to fit one of these:-
http://www.ebay.co.uk/itm/DUCATI-BIL...qixA51EFKKPN9A
I could be wrong but it looks like yours is still the standard steel one.
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S4 Fogarty, S4R 07T, 748, Series 1 Mirage