The phrase "take my breath away" generally refers to something that occurs that is so awesome or momentous that one literally gasps or holds one's breath. The phrase is often used in the context of something beautiful. Examples: "That diamond is so gorgeous that it takes my breath away". A person's first view of the Grand Canyon or the Great Wall or Niagara Falls could "take one's breath away" or be "breath-taking".

"Takes my breath away" refers to something that is so amazing that it makes you gasp for air when you first see it. You can also say something is "breath-taking." For example: The view of the waterfall is "breath-taking." The view of the waterfall "takes my breath away."

When you see something of beauty, you can say, "the sunset is so beautiful, it takes my breath away", or if you see a beautiful woman, you can say, "her beauty takes my breath away". Use it when you are so amazed by someone or something.

If something takes your breath away, that means : 1- you find it extremely beautiful or 2- are completely astonished/surprised by it: Examples - The richness of his voice and the intensity of his gaze took my breath away. ( beautiful , handsome ) - When he mentioned the price, it took my breath away. ( because i'm shocked - it's expensive )

When something is better than fantastic.