The sound, the way it's crafted, its beautiful malleability. Unlike a romance language the lovely sounds need to be caressed out, they aren't embedded, and as such I find them to be much more special. Other Germanic languages I find a bit too rough around the edges, while English can be as hard or as soft as the manipulator desires. There are other languages, I'm sure, that function similarly to English, but no major language I have encountered that exemplifies all the things I love about language quite like English. It's perfectly imperfect.