only slight feedback for you (in terms of saddle time). my only experience with the newer K bikes is a pair of demo rides. tested a '06 (or so) K12S a few years back, and then took out a K13S the other day. the K12 was quite a bit ahead of the K11 (owned a '94K11RS for about 50K miles). the K13 however really impressed me asa nice step forward from the K12 version. much more linear in its power delivery- the K12 had that strong power hit at 7 grand, which although being a real exhilirating rush, i could see where you would want to be paying close attention to where you are in the power band when riding twisties- an inadverdant power hit mid corner could prove "interesting". not so the K13- it was just a super smooth rocket ship from a bit over 2 grand to way up into the revs. i don't think i ever got above 9K, and red is around 13. one of my impressions, along with "wow, what a fine motor, amazing brakes, comfortable, feels much shorter and lighter and easier handling than it looks- damn, BMW really nailed it with this thing", was "where in god's name would i ever get to really use this motor?" (and i live in CO, where plenty of wide open spaces still exist) The bike would accelerate cleanly from 2K in 6th gear, but then you could easily drop 3 or 4 gears and it just goes like snot!
overall, i was really impressed with the improvements that BMW made on this machine.
i was also impressed with the realization that i could either own that bike, or my license, but not likely both.
btw- i wasn't looking to buy, i just had my F8GS in for recall work, and asked what they had for a demo that i could kill some time on while i waited.