I had one of these F900XRs as a service loaner. Of course it's not a rocket ship like the K1300, but it does have a surprisingly good turn of acceleration, quite comfortable even thought the seat is a bit hard it didn't do me any hurt.
The rear mudguard isn't all that, my back was quite dirty after riding the wet roads. I expect parts will arrive to improve that.
All in all, I was very pleasantly surprised at how nice a bike this one is.