I have just bought a K1300R after spending a day test riding a K1200R and the 1300R. Be in no doubt that the new 1300R is a serious step forward compared to the 1200, although either bike would be a great owners proposition.
The power of the K13 is just stunning, pulled away from some traffic in 4th doing 2000rpm and nearly got left behind, the surge of power takes your breath away. With the ESA the bike feels really well planted and loves turning into corners as much as crusing at well over the national speed limit (not me gov!).
If you are thinking of buying the K1300R but are not sure, buy something else, I love the exclusivity of this bike, only a few hundred sold each year in the UK. Rarer and faster than all the lambos, astons etc.
This for me is the ultimate muscle bike as it gives the complete offering - performance, comfort & looks.
Finally, the growl when you get the engine spinning above 4000 rpm is the kind of noise that sends a little shiver down your spine, something akin to a messerschmitt from WW2.