As posted below I just purchased a GX1/14-45 for a trip to Guatemala, Dia de Todos los Santos, at the end of October. Going to rent a 35-100 4.0-5.6, but I also need a prime. Which FL 15, 20, or 25? A lot of the trip will be candid street type documentary. One day will be a volcano climb. I'm leaning to the 20 mm, but there may be times when I want a little subject isolation.