How good is the UMIDIGI S2 camera?

Check out the Day and Night shooting videos of UMIDIGI S2

Discover the Day: https://www.youtube.com/watch?v=vPqXGlKWGRo  

Discover the Night: https://www.youtube.com/watch?v=M6g-cX1ulxU

This video shows the tallest building in Shenzhen: The 600meter Tall Ping'an