retsbox, here is a thread that should help:
http://986forum.com/forums/general-discussions/35443-stiff-clutch-clutch-replace-q.html
When I was shopping for my Boxster I drove various examples and some had extremely 'heavy' clutches, most did not. While I suspect that engagement will never be as light as your Civic, nevertheless it should not be tiring or difficult to depress. If your clutch is not slipping and the pressure point is not extremely high, then I suspect the problem is not with the clutch per se, but rather either the hydraulics ( try bleeding, although it could be the master or slave cylinder); some have also found that replacing (or removing and lubricating) the clutch helper spring on the pedal assembly does the trick.
Brad