My 14 and 45 cover most of my shooting needs but I am greedy and looking at getting another one to improve my overall system. Note that I have 2 cameras to attach/switch lenses. I am deciding whether to get the very expensive 12-35 or 20/1.7 and hope to get some opinions. Pros & Cons: - 12-35 is very convenient/versatile to use, can achieve some reasonable bokeh, is bright, is ideally wider than 14, BUT is so expensive and somewhat big. - 20/1.7 is much brighter, very small, rather affordable BUT is just an in-between focal length for my current setup, not stabilised (assuming 12-35 is)and have to change lens more often than using a 12-35.