DP Review has taken a look at Canon's new 12.8 megapixel EOS 5D digital SLR camera which was introduced recently. Here's a short snip of their review:

By 'full frame' we mean that the EOS 5D's sensor is (virtually) the same size as a 35 mm negative, this means that lenses used on the camera will produce the exact same field of view as they would on a 35 mm film camera (as they were designed). This is especially advantageous when shooting wide angle as we will get a much wider field of view than we would on a digital SLR which 'crops' (such a the EOS 20D). The diagram below demonstrates the difference in field of view between the EOS 5D and the EOS 20D using the same lens with a focal length of 17 mm. The EOS 20D would only be able to capture a portion of the center of the field of view produced by the lens, the EOS 5D captures the entire view.



Link: DP Review