Kawasaki is a calm guy with busy hands. He spends a great deal of time building other engines, which gives him less time to 'fine tune' the bikes. They're still very good, but they evolve slowly. I think Kawasaki will live to a ripe old age. He's more calm than Honda.
Ducati is an olympic girl. She is the most competitive of them all, like Ferrari. She's been ridden by a very young man, who won the MOTOGP of 2007. Currently, he's 4th in the 2008. I have strong hopes for Ducati. Italy invented the Olympics afterall. Italy invented Ducati.
Yamaha started out making musical instruments. Whenever I ride a Yamaha, I feel like I'm playing a musical instrument. 5 athletes won gold medals by using Yamaha archery equipment. He used to make exceptional bow and arrows, but the olympics cried when Yamaha stopped production in 2002.
Claud says: Yamaha is the perfect unity of Archaic Authority.
When it comes to Yamaha, you're paying for the precision. Sure, Yamaha uses expensive materials for their design, but they ultimately charge you for their accuracy. I'll never have regrets with any Yamaha product. It's money well spent.