I came away from my test ride affirmed that the added sizr and power of the K16GT are better suited for my needs right now.
A pro test rider compared the new R12RT to the K16GT using a standard quarter mile for measure. 6 passes with each, tossed best and worst and averaged the other 4 runs = 3 mph and 0.3 seconds difference. If you believe you could tell the difference, it's only because you wanted to!