Mine was the same with an old Centerforce clutch and stock cable. I'm not a small guy and my left leg would get tired after 30 minutes of driving it was so stiff. I always worried the cable was going to snap from the force I had to apply. I replaced it with an RXT and Max Motorsports cable and the first time I pushed the pedal I thought I forgot to hook up the cable to the clutch fork it was that light...lol! Night and day difference!
I bought the car with, I believe, a Spec 2+ clutch. It's hard to justify a $1000 McLeod setup though, just because my current clutch is 'stiff'. I think I would enjoy driving more with a less stiff clutch. It seems I have to brace myself before each shift. Just judging from feel and experience, it's probably about 150lbs of pressure to push the pedal in.