Perhaps you have wished from time to time that you were left-handed, as I have.
News Flash: being left-handed is not an advantage in piano playing! I have this on irrefutable authority.
Since you asked ;), left-handed players’ left hands still take longer to learn parts.
Being left-handed makes turning pages with the right hand harder because the right wrist doesn’t flip as fast. Typically, a left-handed player will move the music way over to the left, then turn with the left hand.