Canon high iso test

Another test with the Canon 5D and 50D, this one for performance at high ISO. I did multiple tests including shooting in low light, and in average interior light at high ISO. The 5D only goes up to 1600, but the 50D goes up to 3600. The images below were all shot at 1600 ISO with a 50mm lens.
the original shot
zoomed in to see detail (click image to enlarge further)

From most of the forum posts I read, the 5D was supposed to perform better at a high ISO. While the focused area in the 5D shots are slightly sharper, the image has more noise than the one shot on the 50D.