I'll be going to San Francisco next week. I plan to take the 12-50 and 75-300. I am thinking of getting a fast prime also. We are going to visit Alcatraz, so I think I may need something faster than what I have. I own the 4/3 14-54 mk II also, but have not bought the adapter as I am trying to sell the lens due to its size. I'd like to hear your recommendations on what prime would be best for SF, or am I good with what I have?