Not surprising. The PAF was one of the few major AF in that era to have major combat experience. Plus the Indo-Pak theatre was much more alike to what a European war would look like compared to the postage stamped sized battle space of the Arab-Israeli wars, so designers took a lot of the PAF experience into account which we had shared it freely with USAF and RAF.They did - in the words of ACM Shamim - it was as if someone took the Air Staff Requirements kf PAF and built an aircraft using it