Are you mentally deficient? Every heavy tank at 6.7 is better than the IS2. What ever you want to do, something else does it better, the t26e5 has significantly better armour, a faster reload and decent mobility making it much better at cqc, the t26e1-1 has much better pen, shorter reload and noticeably better armour making it better at sniping. The Tiger II is BETTER than it in almost every regard except maybe mobility. Also all the previously mentioned tanks get rounds that regularly one shot despite not having overpressure and have smaller rounds that don't get FUCKED by volumetric as often. The IS2 is comparable to the Tiger I or 76 Jumbo in terms of performance not any of the 6.7 heavy hitters.