Vignetting is visible, particularly wide open, but soon reduces to more modest levels and from f/4 onwards is very acceptable for a 24mm lens.

Sigma 16mm F1.4 DC DN Contemporary Equivalent 24mm focal length Ideal for landscape photography and vlogging Price depends on the mount version, starts at $489 / £389 / around AU$600 My TechRadar ...

The Sigma is well made, delivers high quality and handles beautifully, so is high on the list of possibilities if we are looking for a high-quality full-frame 24mm lens, and is Highly Recommended.