What makes driving sport bikes so difficult?

[ghostfashion007]

I am asking this question out of interest to see how each person feels the difference between sport bikes and what makes sum harder to ride then others. I would like to get people with person experience on the different types of "sport bikes". To clarify I want you to say what separates driving the 600cc from others like the 1000cc to the 1400cc. What may differentiate each from each other and what would make them harder to drive over others. Remember this is all on personal experience and like all things, different people can have different experiences.This question is not limited to just the ones listed it for all sports, and super sports.
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