Having travelled around Europe over the last few weeks I'd make the following generalisations. Of course, you need to take into account the inter-breeding over generations which means no country in Europe is homogenous, but I have noticed some things. Anyway, this is what I've observed based purely on seeing guys with soft dicks in changing rooms and other non-sexual locations.
Sweden – pretty average, but with thick foreskins.
Norway – same
Estonia – average, maybe on the small side, but full looking dicks, so possibly showers.
Latvia – no idea, they're quite hung up about public nudity.
Czech – average on the small side. The largest I saw in a public change-room actually belonged to a teenager.
Germany – small, with long foreskins.
Italy – petite.
Of course, this is only soft I'm talking about, and always seen in a public change-room setting. But interesting, don't you think? Or just bullshit based on inaccurate observation?
Looking forward to seeing what Holland has on offer, based on the other threads I've read recently.