I upgraded from an older Bifrost to an older Yggdrasil (this was years ago before the newer versions), and it felt like a meaningful upgrade to me. I liked the Bifrost so much I kept it in another small system and later gave it away to a friend who was just starting to catch the audiophile bug. He enjoys it to this day.
Not sure I would call it a transformative upgrade or anything, but it seemed noticeable and beneficial for me.