Best Android Camera?

After a recent trip to Europe I'm getting really tired of my Galaxy Nexus Camera. I get a lot of slightly blurry shots(only shows up on laptop or larger screens) and low light performance is horrible. I swear my iPhone 4 camera was better. I like everything else about the phone and the $30 T-Mobile plan it lets me use. The Moto X camera has me really worried about the next Nexus phone.

So is the S4 the top Android camera right now?

How good/bad is the Nexus 4(since it is on sale)?