If the framerate is good though? That's what a lot of people criticized Jak for. Hardly any of the PS2 ports are native res, right? Might be good to get a native English speaker's impressions.
http://www.insomniacgames.com/community/showthread.php?51761-Collection-coming-to-PSVITA/page28[The framerate is] smooth, will upload some screenshots soon
I'm not confident on the frame rate yet, though. If he's playing through the first game, there's not a lot going on early into it IIRC.
Sly collection is native and 30fps too. Guess Sanzaru wanted to impress Sony and continue making sly games with what horrible job they did with Gow Collection.
Sanzaru ported Sly to PS3 with added 3D support and new Move mini-games. Next to the original developers at Sucker Punch, they're probably the most knowledgeable about that codebase. They also seem to love those games, so I imagine they wanted to do their best.
The wizards at Bluepoint handled GoW PS3. Sanzaru were likely tasked with porting a port.