Since getting the Pany 35-100, I have found myself never taking the 75m (or 45m for that matter) with me. Today I decided to take the 75 in one pocket, 45 in the other and started the day with the 25 mounted. After spending some time with all three lenses, I think I have very little use for the 75. Although it has great build quality and delivers beautiful results, I just don't know if I am going to bring it out with me instead of the 35-100. Both are relatively 'big' when stuffed into cargo pockets. Unless I am shooting inside in a dark area, I just don't know I would pull it out? I think the 45m has a place, as it is so small you don't notice it in the pocket and it is a great portrait and inside lens. However, I think I am falling out of love with the 75. I have been using nearly exclusively prime lens over the past year since renewing my interest in photography and I had very little interest in even getting a zoom. However, after having the 35-100 for a few weeks I find it is on the camera more and more. Part of me feels like that is a bad thing.