Here are some screenshots from various devices using the same exact car, with shaders on (if applicable) and just using the devices Screenshot function.
First shows the Cobra Jet from Rivals 5.3...
We then use older devices with the lower graphic scale settings and make our way to newer devices with higher graphic scale settings.
This is your baseline. You can see how the game looks on an older device and on higher end devices.
Excluding cars with Matte Paint and Flake Paint (which are separate issues) if your cars look different or worse than the screenshots above please post a screenshot of a car (must not have matte or flake paint) and list what device you are using and your Racer Name.
I'm working on gathering screen shots from racing as well for more comparisons.