People really underestimate Sony's first party offerings, imo. Sure, their franchises may not be as iconic or long lasting as Nintendo's, but they are still quite numerous and usually of very high quality.
Here are some of the more prominent Sony development teams, along with their more notable franchises:
Clap Hanz - Hot Shots Golf
Incognito - Twisted Metal, Warhawk
Naughty Dog - Jak & Daxter, Uncharted
Polyphony Digital - Gran Turismo
SCE Japan (which consists of many dev teams, much like Nintendo EAD) - Ape Escape, Folklore, Siren
SCE Santa Monica - God of War
Team ICO - Ico, Shadow of the Colossus
Zipper Interactive - SOCOM
And you can see more 1st party studios like Evolution Studios and Guerrilla Games here.
And since the list in the OP focuses on publishers, we'd have to include Sony's 2nd party studios like Insomniac (Ratchet & Clank, Resistance) and Sucker Punch (Sly Cooper, inFamous) along with it's 1st party offerings.
It doesn't top Nintendo, imo (Zelda <3), but you have to admit, Sony has quite a bit of developing muscle.
