The pet does significantly more damage than before. I think the overall increase for both of us is around 20-35% or so (I mean me + pet before DoV and me + pet now). A bit early to say yet, since I've only played for about an hour so far. The pet criticalling all the time and not only me is nice ofc. Definitely like the change on how pet crit bonus/crit chance etc is determined. Signifcant dps boost for me at least.
Not to mention the fact that from now on I should see desirable loot mor often since I don't need to be on the lookout for pet boosting qualities.