The C920 and the 922 have basically the same internal hardware, but different firmware.
Beyond that, for the objects in the background such as the bottle looking like it is out of focus, is likely due to the shape of the lens. It is really strange in that the center of the frame is at a different focal plane than the sides of the frame.
You can demonstrate this by photographing items close to its minimum focusing distance.
For example at around 2 inches 5cm, you can exaggerate the difference in the focal planes by taking a picture of anything with that has parts taller than the depth of field of the lens.
![](https://i.imgur.com/TVWy0se.jpg)
With this setup, you can see that with the center of the PCB in focus, the the sides of the PCB lose focus: full size:
![](https://i.imgur.com/OlXT4wkm.jpg)
If I focus on the sticker which is farther away from the PCB, the center of the PCB loses focus, but the sides start to get into focus: full size:
![](https://i.imgur.com/73mJoqCm.jpg)
Overall, the lens is weird and not very well designed.