The Summilux 50 is a fast lens with 1.4 aperture wide open. I know that many just love to use this lens wide open to create dreamlike out of focus areas. I like this too, but when shooting people fairly closeup, then I prefer to have most of the face in focus and therefore I try to shoot @2. Especially if there is no imediate object behind the person. Here I have a small series of portraits of my daughter shot yesterday. All of them @2 and note that the out of focus areas are still nice and soft, but her whole face is sharp.