There is a great old picture I've seen around over 30 years now in books somewhere of one of these with a PzIII hole right through the muzzle.

I think there is even a story using the actual German tank commander's story that because they couldn't penetrate its armour even after circling the bugger, he literally deliberately targetted the huge Soviet 152? cannon and holed it clear though making the gun inoperable.

Interesting monster though huh?
I'm sure Soviet Infanty appreciated it being around.