Here's some detailed comparison pictures of a G1 vs. G2. Both links are to the same Flickr set, but I like the flickriver viewer better:
Flickriver:
http://bit.ly/c03pG0
Flickr:
http://bit.ly/bnnUUN
Flickriver:
http://bit.ly/c03pG0
Flickr:
http://bit.ly/bnnUUN