2pdr vs panzer IV D (short barrel) front - the panzer usually dies in up to medium distance engagements from 1 hit. unless you angle the hull -> decreasing the incoming damage. you wont do miracles with this but it can help survive a 1 shot more than you would otherwise.
cant remember if the panzer IV F2 front is impenetrable.
about possible german bias with their heavy tanks like tiger & panther with the angle mod.
dont forget this also counts for the allied tanks.
the sherman front is quite nicely sloped, and so it the crusader.
while most early war german vehicles dont have this, pzIV, pz III, stugs ...