I think it is the photographer's technique and the lenses that make for sharp images. I think the advantages of a higher end camera are more along the line of how the camera operates . On the bigger, high end cameras, everything you need to adjust are a fingertip away for example. You can adjust settings on the fly instead of going to the interior menus. They also generally have larger sensors which is important if you are enlarging the photos significantly. Also ISO performance is generally better on the higher end cameras -which is a big deal.
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