Well, that's the thing; the big companies aren't making any of those games for the iPhone. You have some ports and remakes but nothing that can really compare.
Maybe a few FF remakes (wow, there's a new idea, let's remake a FF game for something) and some ports or mini-games connected to major titles (like some of the FPSs I've seen that are based upon console FPS series), but those are more like demos than full games.
Now, as I understand it, the SDKs for iPhone games are really cheap, like $100 or so. That's great for any size of developer. But those kits have been around for how long at those prices? And how many of the big developers have been making lots of games for them? If they aren't into it by now, I have to wonder why that is.