Most of you have gone way off point.
How to compare the K20D picture and tell if the K20D is 'better' especially when a different number of pixels are involved?
Simple - you have to use interpolation on the smaller picture to make the number of pixels the same. (not make the K20D picture smaller which could lose the very thing you were looking for)
Now you can compare directly at the same sizes and really see if the K20D gave you anything that couldn't be done by interpolation alone. If the results are equal then you didn't get your money's worth from the higher resolution. If you can see more detail and prefer the K20D version then you did get some value.
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