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Dean i have a 2005 gsxr1000 built to a high spec with ohlins etc and i have a 2012 s1000rr built to same spec meaning it has cartridges in the front, ttx rear and a full system and tune. i Can honestly say there is no comparison in my opinion. The s1000rr is by far a better bike. The chassis is amazing especially when set up right. The power of the s1000rr is immense. When it is tuned right the midrange becomes strong and the top even stronger. The power of the beemer is different from the others i have had. it is like a 2 stroke in a way and when you get to feel the way the motor spins up and you twist that wrist in the right way to tease it out the riding experience is the best. Fourth gear after 8-9k is sublime. The bike in my opinion has a sensitive setup, therefore when changing things such as levers and rear sets it is important to set them right more so than other bikes. In my experience the gearbox will cause a headache if these things are not spot on.
I have ridden the 2015 s1000rr for an hour and can say this in my opinion. The bike is in no way superior to the 2012 and up bikes. The throttle seems a lot different as in smoother off the 5-10% throttle. However after a dyno tune on the 2012 the throttle is perfect . The shifting down is a weird sensation as there is no feeling to signify you are down a gear which can be a problem. This is a new habit which must be learnt and i am happy without it. I believe there are many 2012 and up bikes out there with many mods and low miles going for around 10k and to me this is excellent value for money. i would not spend and extra 5k on a new model. I do not mean to offend any new owners out there and keep in mind this is based off an hour ride, not having owned one. If i were you Dean i would keep the k5 as they will be worth good money in another 10-20yrs and get a beemer ! Life is short