Do you want to compare Sif with Rachel Grey? Discover the powers, weakness & weapons of Sif and Rachel Grey from Sif Biography and Rachel Grey Biography. Find out all about Sif and Rachel Grey.# Check out how is Sif unique and distinct from Rachel Grey. Discover their love interest, sidekicks, family tree and the movies and games list in which Sif and Rachel Grey have appeared. Find out everything about them here!