This is the older, less sought-after f/4 version. The newer f/2.8 usually runs over $2000, but I was able to get this cosmetically scuffed-up copy of the f/4 for under $400! (For the kind of close-up shooting I do, I would never use f/2.8. f/5.6 is generally as wide as I go, even for focusing.) It's pretty hard to tell this lens apart from my other macros in terms of stopped-down sharpness. The sun stars I get with the snoot make this my new hands-down go-to. (May not be a huge deal to some, but I'm trying to sell some glass and I want it to look shiny!) 8 even points, easily spotted, often even in the thumbnail images. All without the ghosting that was a persistent thorn in my side with my 55mm 60mm macro lenses. Some say you shouldn't call a lens "macro" unless it can go to 1:1. I'll let them take that up with the Leica engineers. Like all so-called "macro" lenses, this has a generous reserve of close-up capability for my product shots. (If I were shooting jewelry I suppose I might feel a need to go beyond 1:2.) Like my other Leica macro lens, this 100mm has extra-fine focusing action. My old Micro-Nikkors are not nearly as much of a joy to work with in that regard. The Micro-Nikkor 105mm was my previous BOKEH king. I haven't done a proper comparison yet, but I think this Leitz will do pretty nicely. I'll post outdoor samples as they become available.