I wasn't that impressed by Earth 2
. I liked the art a lot; the story not so much. It is clever to turn the old Justice Society -> Justice League chronology on its head and have the Earth 2 Flash, GL etc be successors to the modern versions of characters like Superman rather than decades-older antecedents. I liked the touch of having the "S" on Superman's cape designed after the Golden Age Superman's (and coincidentally like the one on Cavill's costume in the upcoming movie).
It'll be a shame to see Kara trade in her Supergirl outfit for that lame PowerGirl costume they've designed.