These are some of the smallest lenses that I have evr used. They really are tiny but perform beautifully on the modern cameras offered. You can get all three of these pretty cheaply on the net, only the 40 f1.4 will cost you a couple of hundred. Many will ask themselves why I have so many lenses and the answer is I just like beautifully crafted things. And since photography is my hobby I like to collect these lenses. True I can only use one lens at a time but when I go out, depending on type of mood I'm in, determines which lens I will take. On the Nex cameras I tend to use these small lenses because the Nex-5n is a really small camera. It just makes for a very small system that produce some stunning images. Of course, if the images aren't all that good is entirely the photographers fault i.e. Me. Each lens has it's own character and renders the images quite differently.
So if I like well crafted things why don't I collect Leica lenses some may ask. Easy answer: I just don't have a 100k laying around the house.
These lenses produce stunning images that are really good enough for me.