Three years ago, my family visited New York. My wife "allowed me" to take along only one lens. I took a 50/1.4PKA. However, indoors and out, I would have been better served by a 35/2. When you need a "grab shot", there isn't time to back up to widen your view. When in doubt, go wide; you can always crop.
On the other hand, if your 50 is much "better" than your 35, use the 50. If you shoot in manual focus, a 50/1.4 or 50/1.7 will focus more easily than a 35/2. On my lunchtime walk I now use a 50. Not because it's sharper--my 35 is a Pentax SMC 35/2K--but because my 50/1.7 and my camera are both Sears, and I get a kick out of startling people who want to know the brand of my beautiful black camera/winder/lens and how much I paid ($70). Paul Stregevsky
