Vet 1 is nice,
Vet 2 gives you more range (same as every other heavy tank) non-seige and off seige mode. Also 50% turret rotation
Vet 3 gives more health (+160) better acceleration and for some reason another 30% turret rotation.
Really its vet isn't that good and the extra rotation is kind of pointless after vet 2. Seige mode reload bonus was neft in favour to make non-seige mode more attractive but the veterancy dosnt really support that (or iver mode).
Compare it's vet to the ISU and IS2.I think it's vet isn't good enough.
Edit: forgot to mention the extra health replaced the speed bonus at vet 3(Also sorry for all the auto corrects on my phone
