For me the English language sounds mostly the same. Milder accents I do not detect at all, some English is a bit clearer and easier to understand, others is more mumbled... guess that has to do with accents, but could not say what accents is what...just notice, that I cannot understand it.
I hear a slight difference between American and British English at least...and I notice a thick scottish accent... and I notice, if someone is a non native speaker, especially if its someone from eastern europe who uses English. But others than that... well its all English. In my own language I certainly notice dialects easier.