Unbreakable?
Bundesarchiv Bild 169-0441
(I guess this was rather some kind of aiming practice.)
Seems to have lots of non-penetrating shots though
From 1942 on, the Germans had much more powerful weapons.
From then on, every nation’s heavy tanks suffered the same problems.
The best heavy tanks were often those with a more medium profile.
I would add the Panther to that, which is more heavy medium than light medium