I find that Poles and Yugolavs had some kind of uparmored T-34/85 (130mm front turret).Poles had Super IS-2M with 180mm turret armor (original only 100mm)
I know that i wrote about it but If Panther Ausf A has FC lower than Panther D so why KingTiger has so high FC.(Serial KingTigers had monocular sights, only first 50 tanks equiped Krupp turret has binocular sights.)
If you compare Panther A and IS-2 you find that IS-2 has better sights!