I have little use for a true macro lens. I have tried many, usually having one in the kit (several Canon, Olympus . and Fuji).
Since moving over to Olympus, I find the need for a genuine macro has fallen away.
This is partly becasue my tastes have changed and partly becasue my needs can be met by the lenses I have.
The 12-100 pro, 25 prime and even 300 pro are all good, but the 12-40 is the clear winner.
Maximum magnification allows for macro level abstracts.
Cropped slightly, the lens can actually focus this close or closer, but he 40mm focal length allowed me to shoot out of the fear range of the 1cm long insect.
Another advantage of the 12-40 is the ability to do wide angle close focus images.