The Honda S2000 has the spirit of the NSX, with its light weight and agile aluminum chassis. This S2000 have not been sold in huge volumes or intended to, unlike the 86 or BRZ. Regardless it was a great car and many enthusiasts will sure miss it. The Toyota 86 can be said to stand in-between the Grunty S2000 and the swift Mazda MX-5.
I dont believe that its fair to put any of these two cars in a quarter mile drag race (I am not saying that to justify why the BRZ lost in 0.7 of a second) as they are aimed to be pushed on the curves. It would be nice to see both of them go head to head on a track day. The S2000 is an extra 40 horsepower, over the manual BRZ, along with being 40 kgs heavier and older.
I always wanted to invest in an S2000 back in the days; its is a thing of beauty but the BRZ/86 seems more of the practical & refined option nowadays.
Both cars are of the same class, light weight, good handling, not over-powered machines that revive the spirit of a classical roadster. The end conclusion is going to be subjective.
The net have been circulating with S2000 owners thoughts after test driving the FRS/BRZ/68; the conclusion came as follows: The high revving S2000 has more power output but the 86 has a more practical car with a more capable chassis.
In the end of the day, the biggest favor the 86 did is reviving the classical sports car. Hopefully other car makers will catch up. Nissan is already ambitious about a next Siliva. Mazda is developing a smaller and lighter Mx-5. I am not sure if Honda will consider going back to the game but with the upcoming NSX; it would not surprising if they do. Japanese sports cars are going back to their glory and the coming years seem to be holding plenty of surprises.