Well, if we deliberate about Pz IV frontal armor resistance against Soviet anti-tank fire I think 50 mm thick frontal armor completely protected Pz IV against BT-7, T-26, T-28, T-35 guns while T-34/76 gun could penetrate it at ranges up to about 500-600 meters. Later applied 80 mm frontal hull armor made Pz IV immune to T-34/76 fire at distances over 100 meters. It was unacceptable because Pz IV long barreled 75 mm gun could destroy T-34/76 even from 1500 meters. That is why Soviets had to introduce T-35/85 in early Spring 1944 - its new 85 mm gun could destroy late Pz IV models at close to 1000 meters range so both tanks became equal adversaries then.
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