Originally posted by Docrwm I hear that old saw about the 50/1.4 being soft wide open - just not that big an issue IMHO. Too many people expect it to perform without a hood and due to its exposed front element design it just has to have a hood. Repeated comparisons here and elsewhere show that it sharpens up considerably with a hood in place. By 2.0 its sharp, sharp, sharp. Like all lenses, the 35/2.4 sharpens up too. So, its not a f2.0 vs f2.4 is more an f2.0 vs f3.2 per the evaluation at PhotoZone.
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I'm with you on the hood thing, but if I was shooting a 3d scene, f1.4 is not going to cut it no matter how sharp the in focus portions of the image are. Most of the scene will be soft.
With this focal length, f2 would be the minimum one would be able to get anything useful out of, IMHO.
However, for street scenes, my feeling is that a 35mm lens would generally be more useful than a 50. The 35 is sharp wide open, and the shorter focal lengths also enable lower shutter speeds, which help in low light.
The difference is primarily focal length, and while the 50 is a great portrait lens, the 35 is going to be better suited to street scenes.
Of course, the OP can determine which focal length works better for him/her by simply trying them out with his/her zoom.