Using Comparative:

• "Johnny Depp is a good actor, but his portrayal of the Mad Hatter is even better."
• "His acting is usually strong, but his performance as the Mad Hatter is significantly better than his other roles."

Using Superlative:

• "Johnny Depp is a talented actor, and his performance as the Mad Hatter is one of his best."
• "The Mad Hatter is arguably his most iconic role, showcasing his incredible range and versatility as an actor."