JRST,
stu your results are very good. But remember these are all outdoor shots where there is alot of natrual light. Try in door pictures. with it. than compare it to your kart shaun.
Heres a few indoor shots with virtually no natural light available.
The horse shot especially was shot with flash.
The last shot highlights a shortfall with the camera IMO, it really struggles to capture Smokestone Blue without colour bleed...