[Rover]

Oh yes, I forgot to answer to this.

You use 1.3x crop. Your 24mm f1.4 is a 31mm f1.8 FF equivalent.

The 16mm f1.4 is a 24mm f2  FF equivalent, not sure how that is "squarely" a replacement (but sure, it is fine to want this Fuji lens, just not sure about the similarity).

 

On comparing the charts for the 24mm f1.4 on FF, and this Fuji, the Canon outperforms the Fuji sharpness wide even wide open on your APS-H camera.

I'm not chasing the precise FL/FOV and aperture figures (especially since the former are so fluid due to crop factors). I just have a need for a wide and fast lens (not only for astro), so this Fuji being effectively wider than the Canon is a good bonus for me. In the end, however, it looks like my kit will stay the way it is for a while, because even if the Fuji lens is cheaper than the Canon, the body is most definitely rather expensive. And I'm not ready to ditch the entire Canon system for good just yet.

 

Suppose I could just swap the L for the Sigma and pocket the difference though...