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"Short Sharp Shock" (1997) is hid first feature film, and a very good one. I saw it a couple of years ago on TV and liked it, though it didn`t make the same impact on me as "Head-On". 
Fatih Akin said that he considers "Head-On" to be his first "real" movie, with the three that preceeded it being a period of apprenticeship on his way to becoming a filmmaker. 
I don`t think the difference is this huge, but you should check it out for yourself.