And as Drew pointed out, the difference is merely resolution. A 5 MP camera is pretty damned close to indistinguishable from analog. Only if you blow something up way beyond normal size will you notice a difference.
Hell, all of those pretty Hubble photographs you see? Digital. All of professional astronomy has been digital for some time now.
Case in point: [link|http://www.chapman-anderson.org/pictures/stuff/tn/imgp0144.jpg.html|http://www.chapman-a...imgp0144.jpg.html] which is 1/4 the normal resolution I use, which isn't even the highest my camera will go.