The 996 lost weight from the 993...

If you want to talk about weight, here are the power to weight ratios:

996 2910lb/300hp = 9.70
928GTS 3653lb/345hp = 10.59
993 3064lb/282hp = 10.87
500e 3855lb/322hp = 11.97
e36 M3 3175lb/240hp = 13.23
400e 3745lb/276hp = 13.57

I have a 996 C2 Cab and a 400E. The 996 could run laps around the 400 on any course, and I'm sure it could do the same to the 500.