Ossir seems to me to be still stronger than Iris, if both players are of the same skill level. Also, a lot depends on the lineup, in particular, which hero goes first (it is more advantageous to go second).
Anwen can also win with some luck.
The other heroes against Iris, in my opinion, have very little chance, although it is possible to win with Axel, Vitya, Jalib, but this is already for expert connoisseurs:)
All replays are already available; you just need to browse the thread starting around page 6 (before that, the conversation was about version 3.0).