To those who own BOTH lenses, based on your shooting experience, in what ways do both of these lenses work well together? I have the 20mm and now contemplating on buying the 45mm. I'm currently into still life photography and some street and is interested in doing some portrait as well. I'm afraid that if I get the 45mm, there will be some kind of an overlap between the two lenses and that the purchase will be hard to justify. I'm also considering the Samyang/Rokinon 7.5mm fisheye lens, which I also think is fun to work with. Sadly, I could only afford to buy just one lens. My other lens btw is the 14-42mm which has been screaming for a new owner ever since I got the 20mm.