Well, the dominant profile among cyclists is still "young men riding race bike". But, it is now diversifying quickly and "citizen cyclists" are enjoying more and more the streets of SF, steep or flat.
Whatever the district, cyclists are reclaiming the streets:
Skirt & bike race on Polk Street
One saddle for two to ride on Valencia Street (Mission)
Shopping with a cruiser on Marina
Hipster in Mission
Woolly hat & tank top on Aquatic Park
More cyclists from SF here.