Voigtländer 2/40 vs Konica 1.8/40 on Sony A7R2

The lenses

Lens Mount Design Aperture blades min. Focus Length Weight Filter
Konica Hexanon AR 40mm F1.8 Konica AR 6/5 6 straight 0.45 m 27 mm 140 g 55 mm
Voigtländer Ultron 40mm F2 SL II Nikon AI-P 6/5 9 rounded 0.25 m 37.5 mm 260 g 52 mm

As far as I know, there is only one version of the Hexanon.

There are two versions of the Ultron: The older one I'm testing here, and the newer SL II - S optimized for digital.

The lens designs are very similar: both are modified Planars, where the first negative group has been split into two. The Voigtländer has an aspheric rear element, and shows the typical onion rings in defocused highlights:

KonicaVoigtländer

Tests

All photos taken at ISO 100 using a tripod with EFCS on and a remote release. Developed in Capture One 11, no lens corrections applied, output sharpening disabled. These are 100% crops.

Scene 1 Scene 2 Scene 3

Scene 1 near center (focus point)

  Konica Voigtländer
f/1.8
f/2
f/2.8
f/4
f/5.6
f/8
f/11

Scene 1 edge

  Konica Voigtländer
f/1.8
f/2
f/2.8
f/4
f/5.6
f/8
f/11

Scene 2 edge - Coma

The Voigtländer shows less coma, but also seems less sharp here. This is probably the result of greater field curvature, because in contrast to scene 1 I focused on the center.

  Konica Voigtländer
f/1.8
f/2
f/2.8
f/4

Scene 3 - Sunstars

Photo taken at f/8.

  Konica Voigtländer
Center
Edge