Every department has its own perks. The British had ruled on us for more than 100 years during that period they gave us not only an everlasting infrastructure but very well job hierarchy. They have made the job hierarchies and job descriptions so beautifully that you will have to lard them for that. All the departments have their superiority and at the same time no one is superior. By comparing CSP and army, if one gets allocation in PSP he will surely gets post of BS 22. But a captain might not even get promoted to brigadier. On the other side of the picture the supreme designation in PSP is IGP, the IGP's authority is restricted to Province only. Whereas, the supreme designation in army is General and all of us knows what kind of powers a general contains.
So, one will find a situation of up and down in every department to to create a balance.