In the case of Sing, someone must have really wanted this to be something spectacular, because it shows the amount of care that was taken in certain areas of the picture.
If Illumination Entertainment went out of their way to fill this film with 3D-friendly prat falls, then they surely remembered to plan out the 3D presentation to show them off.
It’s pretty hard for an animated movie to use 3D to its full advantage, as we’ve seen other CGI efforts fall short in their third dimensional exploits (particularly Before the Window).