Judging by the article above, this is a ~30 billion solar mass black hole. Compared to the Milky Way at 1.5 trillion solar masses, this black hole is 1/50th of the Milky Way. It’s important to remember that there are lots of (comparatively) small galaxies, but this black hole isn’t the size of what most of us think of when we think of galaxies. That being said, it would probably crack the top 10 for largest black holes discovered so far!