Summary: I've owned a ton of 35mm lenses. Ultimately this is my favorite one to use on the Leica M (240) because it is fast, sharp, has outstanding build quality, and relatively small. There are some downsides to be aware of: There is some off focus curvature that affects sharpness across a flat target. Google Tim Ashley's review for examples and explanation. Bokeh wide open, especially in the corners, can be harsh; certainly harsher than either version of the Voigtlander 35/1.2.
Excerpt: I'm using the lens on a Sony A7R with Metabones adapter. While the native 55 Zeiss FE lense is nothing short of phenomenal (albeit it could be faster), the 35mm f/2.8 really struggles with handheld shots in low light. I returned that lens, tried the Voigtlander Nokton Classic f/1.4 first (not good, super blurred full wide), then resolved to go all in with the Leica.
Excerpt: I use this lens for travel. Extremely clear, but the minimum focus distance is more than two feet. That hurts it for landscapes. I guess when you pay the price for this lens, you expect it to be perfect, which it is not.
Summary: The perfect lens when you need to use just one. The throw on the focus is just right, the rings are all just tight enough without becoming difficult, and the optical qualities are just perfect from the smallest to largest apertures.
Excerpt: I doubt I'm adding much new here, but the 35 Lux is really the gold standard for the 35mm focal length. I love 50mm! I shoot it a lot! But the 35 Lux is just so useful in almost any situation. There is a reason why the 35 focal length is the most common focal length on point and shoots. The versatility is tremendous. This lens is fast, renders color and contrast like nothing else and is an all around great investment.