Wide angle for a new fast prime; focal length analysis

I'm not sure how accurate ExposurePlot is; the ISO chart shows some settings that are below any used by my cameras, which is odd.

These 596 photographs were taken over a number of years, and not just with M 4/3.

But the picture strongly suggests that if I want to take advantage of the Olympus Australian offer I should be looking at one of the Zuiko wide angles. 

I won't ask for thoughts because these have been extensively covered in other threads; this may be of interest to others though.