I'm sure my opinions are superficial; these aren't my politicians. For what it's worth....
Both Zardari and NS ran wide-ranging businesses and estates before assuming office. Sharif strikes me as a centralizer with tyrannical qualities (he tried to enslave his party's MPs); Zardari as someone who delegates and spreads authority (otherwise he wouldn't be able to vacation in Europe while Pakistan was suffering from the floods two years back.) My guess is that IK's lack of experience will mean that most of the few reigns of government in the hands of civilians will slip again into the grasp of the military.
I still see Pakistan as a state where the military rules, treating ministers as scarcely-tolerated elected functionaries to be removed at its pleasure and only lightly hampered by an assertive Supreme Court. Those politicians who try to change that suffer either death or expulsion. I don't see how IK can change that as he will have no mandate for institutional reform of the military and its privileges.