It has more power and certainly more run time (not an issue for you).
How much more power? Not sure exactly what that answer is but...
We have a user that posted here that he saw a noticeable power increase. He stated that he previously got some orange overload warnings and visible cut grass left behind with his standard Ego mower. When he got the dual battery mower he no longer experienced those issues.
So, it sounds like it is certainly a noticeable difference in power. Which makes sense base on the dual batteries and the peak power technology.