Short answer nope. IS2 will lose to a panther 1v1. And its so expensive, if you can get it. You have already won.
I know and how hilarious is it, in reality the IS2 could one shot a tiger at 1500m, the tiger had to close to 1000m to penetrate the IS2's 120mm armour, the same rule should apply to the Panther all 3 tanks had 120mm front armour, Is2 had better designed armour for deflection and a better gun..yes I said better gun armor-piercing ballistic capped shell of the D25-T 122 mm gun was superior to the KwK 36 8.8cm, there is no evidence on field tests that truly say german optics were better than Russian its folk lore based on, well nothing really.
Field tests of KV and T34's in America concluded at the time Optics of these tanks were amongst the best in the world.
People forget the Russians have for a long time been world leaders in Optics technology.
seriously im not Russian