I can't believe it's taken 2 pages before someone pointed it out.
As said above, the main noticable difference between your current bike and the RSV is the cylinders. A twin feels lazier and less frantic than an in line 4 and is easier to hold a neutral throttle because there's less power surge.
Similar to the difference between a 2 stroke and a 4 stroke motocross bike.
If you do go for a Mille, get the Factory. I road one around the Isle of Man and it was smoother than a Cashmere Codpiece.
They're really good value for money and as a result seem to be the track day weapon of choice.