How do you like this lens? Is it fast like the 85mm 1.8? Care to share some pro & cons about the 28mm 1.8? I'm also planning to buy another lens but confused which one to go either canon 28mm 1.8 or the sigma 30mm 1.4?
I'm quite happy with the lens. Is it fast? It has usm so it's quite fast and quiet. I don't shoot sports with it so that never has been an issue. And in terms of light gathered it is just as fast as the 85mm (f/1.8).
Pros - great sharpness stopped down (normal shooting) and the ability to shoot at f/1.8 when you really need the light or subject separation. Accurate focus. Can be used on a FF camera too.
Cons - Sometimes there can be a little ghosting at f/1.8
People talk that the Sigma has better optics but I haven't tried it myself mostly because it wouldn't fit on a full frame camera (I'm still hoping to get one in the future) but I also was worried about focusing issues. I have rented a couple Sigma 50's and both were great optically but focus was hit and miss a LOT of the times.