2 completely different cars IMO. The only things they have in common are rwd and 2 seats.
The zed is a gt sports car, heavy and semi luxurious(I say that lightly) and the s2000 is built to get its backside kicked in. The zed has power at any rpm in most gears, the s2k needs to be reamed to get into the power band.
I do however love both cars.