Resident Evil 5: PC vs. Xbox 360 and DirectX 9 vs. DirectX 10 - graphics comparison
 

As you can see on the comparative pictures below the two versions look quite similar. DirectX 10 might be a little sharper, but that's a matter of taste. Furthermore the DirectX 10 mode is slightly brighter and seems to have better texture streaming. You might have noticed that Resident Evil 5 has a random zombie pool: The color of the skin and the clothes are changing with each run of the benchmark.
http://www.pcgameshardware.com/aid,6...ison/Practice/