Yeah, obviously bias.
Having 82 kills in 17 battles with F2, 99 kills in 17 battles with Pz. II, both with +85% victories. Playing simulater only
USSR:
2nd KV-1 - 23 battles, 39% victories, 6 kills
1ist KV-1 - 8 battles, 62 %, 11 kills
T-34 prototype - 13, 54%. 43