KV-2 does way better job than the IS-2 due to it's powerful AoE and 240 damage when on penetration. Also it's ability makes it a viable support tank. KV on vet 3 can even become a very good damage sponge as it gets 1200 HP.
I simply can't think of a situation where IS-2 would be as useful as KV-2, and judging by the current KV-2s performance i thought that higher damage per shot would be a welcome change in the IS
Yes. KV-2 is much much better at AI than IS-2 but is also less agile. Furthermore, it's penetration values are quite low so on the off chance it penetrates... sure. You do 240 dmg. But unless the enemy is throwing a P4 at your KV2, KV2 ain't that great at AT.
KV2 at AT is some sort of support. It won't do the job on it's own, but it will scare off if there is a zis nearby. IS-2 on the other hand is more agile and can "solo" enemies easier. Don't neglect the IS-2's [much] higher penetration values, especially in team games where Panther/Tiger/KT spam is a thing. Having SU85, KV2 and what not on the field leaves you wide open to Panther dives. That is, if the enemy is not 90% of COH2 players and actually uses the margins and flanks to flank and go behind you.
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