So, now that Geralt can attack multiple enemies by default, has whirl been removed in the ability tree? Or does it just increase the amount of damage done to non-primary targets as before? I.e. the initial hit does not do the full 100% damage but 50% like before?

I don't have numbers to show, but Whirlwind really "feels" a lot stronger than 1.2 autoattacks, in my experience.

Whirlwind is the last skill in the swordsman tree. I think you meant Whirl.

You're right, my bad, I meant Whirl