The short lens gives a feeling that the photographer was a part of what happens, a tele lens will always feel like an observer because the greater distance compresses the z axis. There are many street photographers, from HCB onwards, that use a 50, but that is on the long side for my style. I mostly use a 24 or 35 mm prime, and sometimes this old compact Tamron. This is a lens I got for free when I bought a used F801s in the early 2000-s and the seller couldn't find the body cap he had specified in the auction description.
To be an effective fly on the wall, I have covered the blazing white logos with black gaffer's tape and carry the camera over my left shoulder on an op/tech pro strap with the lens towards my body. That way, the camera goes unnoticed, even with the f/2.8 zooms until you are ready to shoot. When I see something I want to capture, My left hand goes down and swing the camera forward and the right goes to the grip and I lift the camera to the eye with one smooth move while adjusting the aperture and EC if necessary. I have found it much easier to be unobtrusive with the large bodies like a D300, D700 or D8x0 with a vertical grip mounted as I don't fumble with the grip like with a D7x00, D6x0 or D750. The key here is the smoothness.
I have tried the Fujis, and I can't be smooth with them, The same goes for the Olympus OM-D. The Pen F is another matter, if I had a pure street photo exhibition coming up, I would just have to find the money for a Pen F with a 12 mm Summilux, it is *that* good for my style of street.
My street work is oriented towards capturing quirky details and slices of time and I exhibit some of them when I get the chance and If I haven't been able to use them for two years, I donate the good captures to the county museum and the city library's collection of city documentation, with the proviso that I can still exhibit them. I seldom put one up on the 'net as one never knows what trouble a photo glimpsed on the 'net can do to the subjects. This one was too good not to share, but that is an exception.