That would depend on which device it is running in. As for my Lumia 1020, the general performance (app launch time, responsiveness, camera launch time) of the phone has improved - except in two places: the Messaging app, and the Photos App.
A lot of users (both in these forums and in the Feedback app) have reported issues with battery drain in 10586.29 - but this can be solved easily by signing your Skype account out from the Messaging+Skype app.