Different motorcycles have a different learning curve. I guarantee (as anyone who races motorcylces will agree) that the bike you learn on will greatly affect the skill you develop from it. The 1000's are more difficult to ride, besides just being faster. Learning good throttle control through a corner is next to impossible to learn on a 1000.
I can tell you for a fact that I am a good rider (tons of track time, couple of races, schools, training etc) and a 1000 still scares the piss out of me on the track. Could I handle it in a straight line? sure. Could I ride it well? Absolutely not. Most people who are excellent riders (AMA racers) will even advise you to stay away from 600 supersport models for a first bike for this same reason. 600s are plenty easy to loose rear traction mid corner, and come up way too fast on corner exit under hard throttle without proper control. This is all amplified with a 1000.
I have had multiple friends die on motorcycles, and more get hurt seriously. Take your time with whatever you get
I guess my parting words are this: buy whatever you want, it is you who must decdide, and you who will be happy with what you get. Buy a liter bike, but dont be disappointed when 600s pass you like you are standing still if you ever hit the track, simply from rider skill level. (as a 600 rider, I can tell you that this happens all the time, very few liter riders can actually ride well).
Buy what you want, and all the rest of us can do is prey that that new liter bike scares you to respect it the way it deserves before it kills you. Its obvious you dont respect the power and abilities that these bikes posses. /rant off