Maybe its the kind of bike one comes from or has their "roots" built upon.
I love the feel of my K50 as compared to by '09 GSA, might be that I'm from a dirt background and prefer the feeling as compared to the top heavy beast the previous generation GSA is.
I've only got ~300 miles on mine, only a short stint on gravel road, I've not given it a proper off-road test, maybe my impression will change. Yet, at this point, its a game changer IMHO...
'13 R1200GS K50
'94 KX 250
'97 Toyota FZJ80
'77 Toyota FJ45