Hi Marc nice to hear from you!;-) I made some tests in the studio but with "USM" Furniture (glossy and chrome) and then I checked it. Before I bought the lens I asked Marco Grob because you said to me he is using the lens a lot. And yes, he use und like the 50mm lens a lot and is happy with the quality. But yes, for portraiture its maybe different. I would mine also use for interior and architecture. What are for you "normal" settings in Phocus for sharpening? lg marc