More than enough - we're 38 and facing lvl 42 mobs in our PT2. Friend's smart idea to not bother with sidequests (I guess you can't redo them in the PT 2.5 seems to have backfired as we're undergeared. Still, dying easily does make it more challenging.
Starting through Dishonored, seems ok so far, even if the guard's field of vision is rather narrow and they tend to not look up after their comrade gets a bolt in the head. Probably am killing too many people, but eh.