Not in terms of functionality or ease of use but check this out:
Yahoo dominates e-mail with 88.4 million users in the United States in August, according to comScore. That is far more than Microsoft’s Windows Live Hotmail at 45.2 million and AOL at 44.8 million, not to mention Gmail at 26.0 million.
When you look at how much time people spend reading their e-mail, Yahoo mail users spend the most time (286 minutes a month), Gmail users the least (82 minutes), with AOL and Microsoft in the middle (229 and 204 minutes, respectively).
Wow. As a Gmail-lover, i would have never thought that was the case. You read the whole article here.