The Voigtlander 12mm f/5.6 III (FE mount) never ceases to amaze me. Yes, it is a slow lens. But the optical performance is impressive: great micro contrast, virtually free of distortion, great color rendering, and extremely sharp at f/5.6 and scary sharp at f/8. The lens communicates with Sony A7x II/III and A9 (exif data as well as enabling all 5 IBIS axes). The Voigtlander is a great landscape lens. Despite the widest aperture being f/5.6, I'd opt for it over the Laowa without a second thought.