You need some pics.
Have also led several tours on the K1200R, which is the same exact bike, just no plastic. Might not look like it, but it was a knee-draggin' machine.
The difference between the K1200S & Busa is the Hayabusa has way more horsepower, torque and grunt.
The K1200S was smooth, refined, sophisticated and state of the art (for the time at least). Maintenance costs way higher, the Busa is a tank. We sell more Ohlins shocks to BMW owners than any other brand b/c the shocks are toast after 30K. Shaft drive made power delivery very smooth. Roll on, roll off.
Two-up Touring you can set any bike up for.
The fork takes some getting used to. It's heavy at low speed, but once you are up and running you get used to it. There is no dive. That's BMW-engineering for you.
Where the K1200S was most different was in the handling. Similar wheelbase and weight, but if you look closely at the K1200R without all that plastic, the motor is rolled forward to change the center of gravity much lower. So despite the heft and weight, it was amazingly flick-able and handling in the hyper-twisties at speed was fantastic.
The downside to the K1200S for me though is what most reviews thought, it's somewhat dull, uninspiring and mellow. It doesn't make you drool all over yourself. The bodywork is okay, distinct enough to be BMW, but not unique enough to really stand out (Busa is one-of-a-kind recognizable).
If you watch this video, you can see how it handles. Shot aboard the K1200R, but again, same exact bike.