Yes. The fonts looks much better in this version. The new tabs are cool, especially if you spend the rest of your day in Safari. It also uses the keyboard in a much more Mac friendly way.
The fonts are easily adjusted in Carbon Emacs too.
How is it friendly to a mac keyboard?
There doesn't seem to be anything new in that respect. In general though, Aquamacs better supports native mac shortcuts like Apple-S, Apple-F, and so on.
Fair argument, but I'd recommend using TextMate then.