[Brightcolours]

Sharp enough wide open (f1?), not LoCA free at all (did not expect that) and outlining wide open which will hinder the otherwise smooth background rendering. But it is not as if other super fast lenses of around 50mm render better (for instance the Canon EF 50mm f1.0 L USM, or Leica Leica Noctilux 50mm f0.95, Canon 0.95mm f1.0).
https://www.dpreview.com/articles/668031...fic_source