Do you mean to say there is no class "not caste" system in Pakistan? Caste is just a sub sect of class and class system exists in every society irrespective of religion or prosperity. Class like caste is inherited in form wealth and familial connections. Why single out India when discriminatory system exists everywhere.
In Pakistan irrespective of Islam does a common man get the same justice, govt attention and priviledges as a Sharif or a Zardari. Further the social stratification among Muslims in the "Swat" area of North Pakistan has been meaningfully compared to the Caste system in India. The society is rigidly divided into subgroups where each qoum is assigned a profession. Different qoums are not permitted to intermarry or live in the same community. These Muslims practice a ritual-based system of social stratification. The Quoms who deal with human emissions are ranked the lowest.
Stephen M. Lyon of
University of Kent has written about what he calls "Gujarism", the act of
Gurjars in Pakistan seeking out other Gurjars to form associations, and consolidate ties with them, based strictly on caste affiliation.