i havnt seen a comparison against the 2010 yz450f. its a whole new animal. they took the best handling bike and made them even handle better, its a 100% new bike, honda went fuel injected on 2009. yamaha had the same motor they had in the bike in 03 in 2009.
im not arguing what a better bike is, it seems all like personal preference. no matter the color of the bike im sure bubba stewart will dominate the competition, lol