I have a black 17 1.8 on order. It won't be here until the fall so I have time to endlessly rehash my decision . Other than the 35 vs 50 FOV debate what to folks think about these two lenses. I am primarily looking for a fast low light lens, that might also be part of a travel kit. Currently I have - 12-60 14-54ii 50-200 12-50 (macro and travel) 14 2.5 (travel or street) My only other real want is a UWA lens. Either the 7-14 or the 9-18 but neither are fast so they don't fit into the 17 vs 25 debate. I am currently leaning towards the 25, as it is a bit faster than the 17. However I am more likely to shoot at 17 than 25. But maybe I need my assumptions challenged.