FWIW--I've been shooting with the same 45mmf/2.8, 80mmf/1.9 & 150mmf/3.5 for years. I have thought about getting other lenses, something really wide 24mm or really long the 300mm or 500mm but never do get them. One thing people have talked about is the filter size thing, my 45mm and 80mm use a 67mm filter and the 150mm uses a 58mm filter. I just use a step up ring 58/67 so I only have to carry one sized filter, I just use the hood from the 80mm when I want a hood.