I got the lens. And as said it takes time to learn and experiment! I am trying to think of the planes and avoid holding the camera too much (indeed a tempting thing to do). And focusing is a challenge, even with live view.
The lens is sharp but I noticed quite some CA. Perhaps because I shot wide open (which occurred accidentally because I forgot to select the wanted aperture after focusing ;-) ). But it's much more than e.g. the 60mm and 105 macro lenses.
I am going to write down my findings and questions so I will probably be back with some questions!