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I've done a side by side comparison on some landscape images from the 20D and 50D. Reviews are saying that the 50D is only marginally better than the 40D in some areas and in others it's slightly inferior (but essentially close). Image wise, there is very little difference in the comparison between the 20 & 50D, the 50D has a little more contrast (and dynamic range on paper), the 50D has slightly higher resolution, not noticeable unless you pixel peep at image scales greater than 100%. Images out of the 50D with standard settings are often not as pleasing as those from the 20D. The 50D (and 40D) has live view, a definite plus if you're interested in Astrophotography.
In conclusion, you would be hard pressed to see any difference in terrestrial images from the 20/30/40/50D
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