I dont think I would call my 996 C4S a GT. I think it drives like a beast - clawing its way through the twisties. I think it handles better than my 968 did... And certainly better than my 84 930 (not surprising). It is heavy. But its wonderful!
What I like about the 996 is that it can be very tame. And CAN be driven like a 'normal' car if I am feeling tired. So its a good daily driver for me. BUT.. If I step on it, and hit the curves a little hard then it really seems to snap to life. The PSM is nice - You can turn it off... But when its on, I can still get the tail to wag a little. If I turn it (the PSM) off and hit a 90 degree turn at 45mph... WOW it feels good. no lean.. just tight suspension.
I love that car!
And I love the 993 too - not better, its just different.
Oh, and I have had a go with a few current style M3's -And NO WAY is an M3 faster than a 996.