I have put enough miles on a K1300GT (>1k miles) to be surprised to see it in #2 position. It doesn't feel as fast as the FJR in normal driving, I had to beat the snot out of it to get it to go. Ohhhh, it has a 6 speed. Booooo, the 6 speed did not have the right ratio mix for the way I drive so I was constantly shifting 2 gears up or 2 gears down to get the performance and comfort I was looking for. The K1300 made my FJR look like an automatic.
A chain drive will let less HP perform better than a shaft drive but the chain is not as maintenance free as the shaft. At some point the chain will need cleaning, it will need adjusting, it will need replacing but a good oiler will help.
The comparison is amazing the way it includes apples, beef, artichokes and ghost peppers then declares a ranking scale