Team Ico
Studio Liverpool
Sony Studios London
Japan Studio
Polyphony Digital

Because Drake has ni- oh wait, that doesn't work here.

Eat Sleep Fucking Play was fucking founded by fucking David Jaffe, so it must be fucking awesome because he made God of fucking War and Twisted Fucking Metal.

As for Quantic Dream, they've already released Indigo Prophecy, though that wasn't PS-exclusive. But CGI-Quality made the list, and how can he not include the developers of Heavy Rain?

Team ICO haven't even released a game this gen, Polyphony haven't released a full one, Guerilla and ND have each released one. Only Insomniac has released four

Naughty Dog
Santa Monica
Guerilla Games
Quantic Dream
Evolution

Here's my top devs.

1.Naughty dog
2.Sony santa monica
3.Insomiac
4.Guerilla games
5.Evolution studio.

Exactly why Insominiac are at the top and Naughty Dog above Team Ico. Team Ico and Polyphony make the list through past accolades alone and because of their sheer awesomeness! Oh, and Guerilla have only released 2 in total for Sony and only this gens game was actually good... but I prefer Uncharted and SotC so they came 5th, lol.

1. Team ICO
2. Naughty Dog
3. Sony Santa Monica
4. Japan Studio
5. Media Molecule

1 - Santa Monica.
2 - Naughty Dog.
3 - Polyphony Digital.
4 - ICO.
5 - Guerilla (wouldn't have been here before KZ2).

Guerilla released three for Sony, including Killzone: Liberation for PSP. That was somewhere between KZ1 and KZ2 in quality, I believe.

Insomniac and Naughty Dog are pretty much equal in my eyes. If Insomniac had continued to make a Ratchet every year, or even had made a new IP which was just as awesome as Uncharted, and made a Ratchet every two years, they would easily top Naughty Dog for me. Resistance: Fall of Man seemed original from what I played of it, but Resistance 2 was a step in completely the wrong direction. Away from originality and individuality and closer towards CoD4 and Halo 3. I do prefer Ratchet to Jak, but I would rather have Uncharted than both Resistance games combined. Also, Naughty Dog made Crash, and Crash > Spyro.

My favourites are Santa Monica because God of War is awesome. It and its sequel are two of my favourite games of all time, along with Shadow of the Colossus from Team ICO. Those two studios are pretty much in a class of their own. Then come Insomniac and Naughty Dog, one above the other depending on my mood, and then Sony Bend, who everyone seems to forget about. Perhaps you know them better as Eidetic? The developers of Syphon Filter. While the first few haven't aged well, they were great for their time, and the PSP games are awesome too. Resistance Retribution was also decent, apparently. I want a PS3 Syphon Filter!

1. Polyphony Digital
2. Guerrilla Games
3. Insomniac Games
4. Sony Bend Studio
5. Sony Santa Monica Studio

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And BIG respect for all studios for a really great games!