Summarized from the Book of Al-Fiqh 'ala al-madzahib al-khamsah, here is the view of the imam of the school on the law of qunut:
Hanafi: In prayer there is no qunut except on witir prayer
Shafi'i: At dawn prayer and witr in the second half of ramadhan circumcised qunut after lifting his head from ruku 'on the second rakaat as it is recited reading surah Al Quran after fatihah.
Maliki: Sunnah read qunut at dawn prayers only.
Hambali: Qunut only on witir prayer only.
Imamiyah: Qunut is circumcised in every fardhu prayer.
Seeing all the opinions of the Imams of the School, there seems to be no striking difference between their opinions, it can be said that all Imams of the school view that qunut law is sunna, but its position is different.