I currently own the 17 1.8, 45 1.8, and the 25mm 0.95 lens from Voigtlander. Out of all these focal lengths, I seem to use the 17 most. I generally take pictures of family and vacations or events. I'm so confused on what lens to purchase next. I'd like to get rid of the 45mm, since I rarely use it (it's too long). The 25mm I love for the Aperture, but feel like it's a little long sometimes. I was thinking of either a 12-40mm Pro or the 17.5mm Voigtlander. The 12-40 would be very dynamic focal length wise, but I love the 0.95 aperture of the voigtlander. Anyone have experience photographing with the 12-40 in low light? I think probably that's what's getting me hung up the most.