My team dogfoods Ubuntu for Android every single day on the Nexus 4, and I'll say that it's performant enough to be a daily driver as a desktop replacement.
Edge has 4GB of RAM planned, and will run even better than the N4.
Edge has 4GB of RAM planned, and will run even better than the N4.
So we still use the Android software to drive the camera.
As a photographer though, I have to say that I don't exactly hate the N4 camera. Built-in HDR is kinda nice, and has saved many shots for me.