Specifications
Review
The build quality is superb and despite the use of high quality plastics (rather than metal) it certainly deserves Sony's GM designation here. The weather sealing is also aligned to professional use. Quality of the bokeh is second to none.
Bokeh comparion
Sony
Canon
Diaphragm is very circular, thanks to 11 rounded parts.
https://www.focus-numerique.com/news/retour-sur-le-nouveau-sony-g-master-100-mm-stf-19529.html
Field test
http://www.imaging-resource.com/lenses/sony/fe-100mm-f2.8-stf-gm-oss-sel100f28gm/review/#fieldtest
First lens buyer
https://www.ephotozine.com/article/sony-fe-100mm-f-2-8-stf-gm-oss-lens-sample-photos-30606
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