I really did not expect better image quality from the X800 Pro over the 9800 XT but I still ran an image quality test to verify this. The image quality test was taken using 3DMark03 for its consistent nature of snapping the screenshot. I tested both the X800 Pro and the 9800 XT with Anti-Aliasing on 4x and Anisotropic Filtering on 8x. I also conducted another tested but with Anti-Aliasing on 6x and Anisotropic Filtering on 8x. You can see from the two images below (click to enlarge) that there is not any noticeable image quality difference between the two cards.
Idle/Load Temperature Test