The ultimate 40mm lens for street photography?

I wondered enough to finally get one, hoping to find the ultimate 40mm lens for street photography: the Minolta M-Rokkor 40mm 1:2 is a very light lens with a relatively long focus travel and a tab to further support easy focussing. And because it is in Leica M-mount it means that the register distance is short, so the total length of adapter + lens on the Sony A7R2 is also really small.

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