Check out this video that shows a gold iPhone 5S vs. iPhone 5 scratch test. The video was posted to YouTube by iPodUplink.
The scratches caused by the coin did virtually no damage to the gold iPhone 5S while they caused quite a problem with the black iPhone 5. Because of the materials underneath the black version shows obvious holes in the paint that look terrible, this however was not the case with the iPhone 5S. When it came to the knife test overall the damage looks worse on the gold iPhone 5S. This is because the long marks and deep scratches are more visible with the gold background. The iPhone 5 black shows practically nothing other than the parts where the silver underneath shows.