I was aware of the post of CamFan and that inspired to actually measure the angles of the 2CD2352 at 4mm from a borrowed camera.
So horizontal angle of view is 65 degrees and vertical angle of view is 48 degrees. The horizontal angle of view is very similar to the new Chinese targeted camera 2CD2355 as seen in its data sheet.
Another observation is that the official horizontal angle of view of the 2CD2342 (the previous 4Mpixel) at 4mm is 83 degrees and its vertical angle is 106 degrees. Therefore it seems that the lower resolution 4MP camera at the same focal length lens (4mm) has a wider view than the newer 2CD2352 camera. Interesting.
Now I am still looking for the angles of view at other focal lengths of 2CD2352.