I find the 35mm range is my go-to tool for the indoor stuff, and when outside, when the background is close to the subject, or when I simply have to be within a few feet and can't be far away. That short distance to subject with wide aperture leans towards that crazy thin depth of field, if you want that look, otherwise, you can stop down a bit and still nail great depth of field, but get ridiculously sharp images that still blur near backgrounds where a telephoto would keep the background sort of in focus. It's also easier to get a group at 35mm given the work space. The other benefit of 35mm, is that your flash has to do less work. You're closer, so your lighting is closer, which means less power, faster cycle times, and more shots for the battery life. I don't think the 35L specifically is so dreamy. I think it's just the focal length, the wide aperture, and the properties of using a wide focal length that lacks the distortion of really wide focal lengths along with sharp shots at wide apertures at short distances. You would get the same results using a Sigma 35, and very similar results with an EF 35 F2 IS, or even the Samyang 35 F1.4 (fully manual, not ideal for weddings of course, but for engagement it's fine and portraiture in general). That short focal length is great for those shots where you want hands, rings, kissing shots, things that are not full body portraiture where you want to be close and not standing at the edge of a rail to compose with a telephoto. There's something personal about being 2~3 feet away with a 35mm lens, rather than 10+ feet away with an 85mm or longer. 35mm is also easier to do environmental inclusion shots, where things in context are in the photo, and not completely blurred out. Also, 35mm is easier to do different perspectives with, like from below or from higher up, by dropping to a knee or stepping on a chair/stool, etc.