The series finale of Korra shares some parallels with the Sozen’s Comet arc in ATLA as all of the major characters have their major moments.
A lot of series finales drop the ball, but everything wrapped up beautifully in The Legend of Korra, just like it did in Avatar: The Last Airbender.
And while I actually prefer “Sozin’s Comet: Part 4” to “The Last Stand”, I think they’re both phenomenal episodes that do their respective series justice.