I'm a new user from Northern Italy.
I'm also a new K12S user (bought it 1,5 months ago after 9 years with a 954 Fireblade, and.. and...).
I've been once to Colle delle Finestre with my Fireblade, and, as you can imagine, not the right bike for unpaved and narrow roads..
anyway there are definitely lots of better roads/places in my area, just think about the Dolomites
So, for our standards, Colle delle finestre is not really a special place