How much better IS full-frame than crop?

Jim Cassatt wrote:

When my 5D arrived in 2006, I decided to do a test to demonstrate how much my 5D was compared to my lowly 300d (the original digital Rebel). So I took the same picture at the same position with the camera tripod mounted using a 70-200 f4L lens. I adjusted to get the same FOV by varfying the zoom ratio. I then printed both pictures to 12x18. When I show people the two prints, they have a hard time figuring out which camera took which picture. There results were posted at: http://www.pbase.com/jcassatt/canon_5d_vs_300d
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Jim
http://www.pbase.com/jcassatt