Sigma 105mm F1.4 DG HSM | Art (L-Mount)

Reviewers found it sharp right into the corners at f/1.4, with negligible distortion and very low lateral colour fringing and bokeh fringing. Background blur is described as exceptionally smooth, with seamless transitions; the only flaw noted is a slight onion-ring texture in some defocused highlights. Vignetting at f/1.4 is visible but not severe.

The criticism is almost entirely about size: it is very large and heavy, needs expensive 105mm filters and has no stabilisation. HSM autofocus measured quick and quiet with good repeatability, though focus breathing is clearly visible. Reviewers rate it among the best portrait lenses available despite the bulk.