Hero - I think you have missed the point. Cartier-Bresson chose a very unobtrusive, small camera, with a tiny, obsolete lens that he covered in black tape. He used in a very anonymous manner to create some absolutely outstanding images. He did not even use the relatively small contemporary 50mm lenses that were available to him. He did not generally use the 35mm or the 90mm or the 135mm lens that were available to him on his camera. Film SLRs were certainly on the market when he was active, yet he did not go there. No magnificent Rollei TLR or Hasselblad cameras either. I rather suspect a zoom lens would not have been on his camera, that would have been out of character.
When I head downtown to take pictures, I will usually take my crop-frame camera with a fixed 35mm lens so I don't stick out. Sometimes I just head out with a cheap old point and shoot. That way I am anonymous. If I throw my f/2.8 70-200mm lens on my D800, I get totally different shots, because this gear make people aware that I am taking their picture.
Technology is not important; the results are.