Here are some more comparisons between San Francisco and Manhattan.
Rich/Affluent Neighborhoods
San Francisco (Pacific Heights):
Alta Vista by
Brandon Doran, on Flickr
Manhattan (Upper West Side):
The Lake and the Upper West Side skyline by
Apostolis Giontzis, on Flickr
Large City Parks (I think both of them were designed by the same person)
San Francisco (Golden Gate Park):
Golden Gate Park and Ocean Beach in San Francisco by
David Oppenheimer, on Flickr
Manhattan (Central Park):
Manhattan (central park) by
Paco Gaitero, on Flickr
Hispanic/Latino Neighborhoods
San Francisco (Mission District/ mostly Mexican and Central American):
San Francisco-Mission District by
emile lombard, on Flickr
Manhattan (Washington Heights/ mostly Dominican):
Alto Manhattan (Washington Heights) by
何塞埃利亚斯 (何塞·克鲁兹), on Flickr
African American Neighborhoods
San Francisco (Fillmore District/ Western Addition):
San Francisco / Western Addition's History by
Mark Denton, on Flickr
Manhattan (Harlem):
Harlem by
Miryam HaMagdalit, on Flickr
Two of the finest examples of American urbanism and each one represent their respective coasts very well.
I will do some of the other comparisons/analogues mentioned in the thread so far like Brooklyn and Montreal and San Diego and San Antonio.
I'm surprised anyone hasn't mentioned London, Paris, and Rome, New York and Paris, and Chicago and Toronto. I will look into those in the future.