Sorry Robin I know how pedantic you can be about energy and internet speeds etc and whilst I appreciate you don't have the best in terms of speed and such you cannot have my poor old eyeballs as I need them.
However if you want to do any sort of comparison just to get the idea (slightly exaggerated of course).
Then do a google search for "arduino 101" and take a note of the constrained view.
Now take a look at some of the larger format ones compared to a 640 x 480.
Here are two examples keeping it Arduino as requested Later on I will take a couple of shots and post them up elsewhere for you to see the difference in the ability to zoom in if you download them.
If you click between two tabs showing the picture the blur on the lower res pic is glaringly clear