Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 4 months ago

The A'lam is the most learned A'alim among the Ulama. He is determined by the high caliber scholars أهل الخبرة who are able to determine the most learned after going through the scientific works of leading Ulama. Those high caliber Ulama are the high rank scholars in the Hawza in Najaf and Qum and other places.
Most of the high caliber Ulama in Hawza now a days say that the most learned is the grand Ayatullah Sistani may Allah grant him long life.

Wassalam.