OC Workbench has a screenshot from of 3DMark 2001 comparing the graphics quality of the new SiS Xabre 400 to the nVidia Ti4600 and the older GeForce 3 Ti200. While the differences are hard to spot, it's easy to see the lighting of the GeForce 4 is more enhanced, everything stands out much better. nVidia's drivers are much more mature compared to SiS's drivers, and it's just one screenshot which can hardly make or break either product especially since we weren't even told what graphics settings were used.
More information at OC Workbench.
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