I have 50mm F1.2 and is amazing¡¡ Is true that in low light situations that aperture is very useful. But for portraits, is a very good tool too. Is not easy but I like it. In the other hand, the quality of the image is superb, also with "normal apertures". I believe that this lenses are much better in terms of the lens like itself....I don't know if you understand my idea. I like the wide aperture for portraits, but also the quality of the product (lens).