The Canon 50/1.5 is my favorite 50mm traveller lens. I use it rarely at f/1.5 but at f/5.6 it can be used without any regrets, even as a landscape lens, and the results standing on a very high level, on par with modern glass. Except, it is a bit "milder" in contrast, has warmer color rendition, and the OOF transitions the Sonnar type is well known for.