i think we are all a bit guilty of getting carried away with capacity, we like to think that because we ride a 1000 that it must be fast but in truth our 10 year old 1000 technology is performance equal to a modern 600.
modern 600 performance and lighter bike must give a similar power to weight ratio,
the benefit of our bike is that it still handles well given its age (and was bloody great in its day) and because its a V twin the power comes in early with lots of traction so when road riding we can access the performance more of the time giving an early advantage which is eroded a bit on track.
i would imagine that a 4 year old Gsxr K5 1000 has a similar mid range with stacks more top end to an rsv
BUT what often gets forgotten is that we are not comparing £ for £. i bought my rsvr for £2300 with loads of extras, that's bloody cheap for a bike like ours with ohlins, oz, brembo, carbon etc
it still handles & brakes well, good stomp, feels special and exotic and has a good scene and camaraderie to go with it and is £3-6k cheaper!
if you want to take on a jap 600, 750, 1000 just make sure you are a better rider as that is where real speed comes from.