Brilliant, Oct, +1.
So I made a plot with Excel of number of representatives in the EP and population, turns out there's not at all a logical pattern. By my analysis, even taking into account that small nations should have a somewhat stronger say than large ones, I find the following countries to be somewhat overrepresented:
Germany, Sweden, Hungary, Lithuania
and the following countries somewhat underrepresented:
France, the UK, Spain, Luxemburg.
(And the Netherlands tend slightly to underrepresentation, but only marginally so.)