Scott's stepped on his S4 pretty hard, so I'm sure the HP is same or better than the R6, and the weight is very close with 40 lbs. trimmed off. It's that 50% more torque (50% more displacement, that's why) that's gonna blow the R6 away.
I haven't touched my motor, and I still wouldn't trade my bike for an R6 with $4k in the tank bag. I just don't want an R6.
This is from his second post, so don't beat on him too hard:
" I have a 620 and now hooked. Although the R6 pulls harder, corners better, and basically outperforms in all aspects of the S4 that I have ridden, its just not the Ducati."