Laowa 14mm f/4 FF RL Zero-D (L-mount) vs Sigma 35mm f/1.4 DG DN Art (L-mount)

These cover different focal lengths — the Laowa 14mm f/4 FF RL Zero-D (L-mount) is 14mm, the Sigma 35mm f/1.4 DG DN Art (L-mount) is 35mm — so they're not really substitutes. Pick by the field of view you actually need: the Laowa 14mm f/4 FF RL Zero-D (L-mount) for wide-angle, the Sigma 35mm f/1.4 DG DN Art (L-mount) for short-telephoto / portrait.

Choose the Laowa 14mm f/4 FF RL Zero-D (L-mount) if you shoot wide — it starts at 14mm vs 35mm for landscapes, interiors and architecture. Choose it if you value portability — at 228g (8.0 oz) it's lighter than the 645g (1.42 lb) alternative for travel and all-day carry.

Choose the Sigma 35mm f/1.4 DG DN Art (L-mount) if you want more light and background blur — f/1.4 is faster than f/4, better for low light and subject separation. Choose it if you need more reach — it goes to 35mm vs 14mm for distant subjects, wildlife and sport. Choose it if you like close-focus work — 0.19x magnification vs 0.07x. Choose it if you work outdoors — it's weather-sealed against dust and moisture; the other isn't.

Aperture: the Sigma 35mm f/1.4 DG DN Art (L-mount) opens to f/1.4 vs the Laowa 14mm f/4 FF RL Zero-D (L-mount)'s f/4 — more light and shallower depth-of-field.