I already have the 90mm F2 and uses it to shoot wildlife/portraiture, very satisfied with the IQ, sharp in focus and creamy bokeh out of focus. During a trail I constantly need to switch between the 10-24 mm and 90mm lens.
I'm considering adding one lens. 56mm is highly praised for portraiture shooting and its samples are stunning. But would the 56mm kind of redundant when I already have 90mm even though it's faster at F 1.2?