I've found that the battery on the Galaxy has gotten better after a month or so of discharge/recharge cycles too. I can get 2 days of light/moderate use out of it.
It's still a bit galling this is all you get though, considering it sits in my pocket for a fair chunk of the day, with the screen off, doing not much. Especially when it's meant to have a class-leading batery and a low-power OLED screen... but that's a different discussion