Some historical stories about IS-2 which i just found.
JS-2 in Comparison to the German Counterparts
Foreword
A comparison of the JS with German heavy tanks of WWII shows the big difference in design and war theories between the USSR and Germany. For example, according to the Soviet classification system, the JS-2 was a heavy tank, while the Panther was a medium tank according to the German classification system. In fact, both tanks were of equal weight. So why the difference of classification? Simply, because Soviet tank designers thought the weight of a vehicle to be the most important parameter by which to define most other parameters like engines, armor, armament, ammunition, fuel capacity, suspension and so on. At the same time, German designers distinguished tanks by their battle capabilities — mostly by armament and armoring. That's why Pz-IV's of the first series were considered
JS-2 in Comparison to the German Counterparts
Foreword
A comparison of the JS with German heavy tanks of WWII shows the big difference in design and war theories between the USSR and Germany. For example, according to the Soviet classification system, the JS-2 was a heavy tank, while the Panther was a medium tank according to the German classification system. In fact, both tanks were of equal weight. So why the difference of classification? Simply, because Soviet tank designers thought the weight of a vehicle to be the most important parameter by which to define most other parameters like engines, armor, armament, ammunition, fuel capacity, suspension and so on. At the same time, German designers distinguished tanks by their battle capabilities — mostly by armament and armoring. That's why Pz-IV's of the first series were considered
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