I have the non-L 100mm myself, bought many years ago before the 'L' was available. Does anyone who has upgraded from the 'non-L' to the 'L' have a view whether they can see a material difference in image quality? These are some of the flowers in our garden, taken today.
I have used both and own the L, there is zero material difference in image quality, the only way to tell the difference in some images is by the bokeh, it is much smoother with the L due to the different shaped aperture blades. In your images 1 and 3 would look indistinguishable with both lenses, but image 2 would look slightly different in the background.
Unless bokeh is a major concern IQ is not the reason to "upgrade", however the other niceties might be; bokeh, IS,
internal focusing (lens stays the same length)
(my mistake, they both have internal focusing), weather sealing etc were enough for me to get the L.