This is just a subjective observation (hope others can add their own)
I would say that it's louder. Not a very huge improvement, but louder. I would say 15% louder. (But remember, the reference is not very loud. I would still classify the 15% max improvement as (still) not very loud overall)
The sound is definitely richer though. It seems to have more "body".
Also, I would consider the placement of the speaker on the side as a worthwhile improvement. Especially for phone calls.