These were taken with all in camera corrections off, on a tripod, manually focused. They were processed in Lightroom, all corrections off (although it said it was using a built in profile for the Tamron.) Minimal sharpening applied.
All were taken on my a7R III, in silent shutter mode. Focus was on the bolt seen in the first set.
Hopefully this will give you an idea where I pulled the crops from. I choose the focus point, top left corner and then another area where there was noticeable difference between the two lenses.
Left - Tamron 35mm f/2.8 Di III OSD 1:2 / Right - Voigtlander APO-Lanthar 35mm f/2 Aspherical