What is quam with superlative?
(4) In Latin, quam with a superlative means “as (whatever the adjective is) as possible.”
What is the use of QUAM?
You may use quam = "than" with the standard in the same case as the entity compared: ego beatior sum quam ille. The Ablative of Comparison, however, can only be used when the thing-compared is in the Nominative or Accusative case.