I realize this is a subjective question, but I’m wondering which is a more appropriate portrait lens for Leica - the 75mm or 90mm. I typically use an 85mm with my DSLR sand mirrorless systems. I’m pondering renting the Leica Monochrom and would only pick one, if I elected to rent a longer lens. A friend also told me that the frame guides get smaller as the focal length increases. I don’t know if that’s true, but basically 75mm would give a larger frame guide than 90mm. I’m looking at the APO lenses and from what I’ve read they’re both very good, with the 90mm having more aperture blades. Thank you!