The S has clearly more torque in the low rev range, but feels less punchy in the top end (probably due to the fact that the torque curve is more linear).
It doesn't make much more sound than the 2.7 either.
I didn't try the full braking power, but I'm sure there is a big improvment over the base model here !
The suspensions are much stiffer, but still comfortable. The S may be more fun when driving at the limits.
But I really don't like the center opening for the third radiator ... it looks like a cheap aftermarket part !
They both have pros and cons