For comparison purposes, I thought it might be useful to snap some shots of the cams (and associated display images) for both my X5 and my Honda Odyssey. They are both sitting in a double garage looking down my driveway to the street with both cameras about the same distance from the street.

You can see that they both do a good job of showing what is behind you. The Honda cam seems to have a bigger field of view, but the BMW cam is sufficient for the job. I actually prefer the image quality of the BMW cam as it has better color saturation and image detail. Both are good.

Attached Images

    

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2005 X5 4.4 (Sterling on Truffle) w/sport everything
2011 Audi S4 (Prestige, DSG)
2012 Audi Q7 (Sport, S-Line)