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Contax rangefinders are autofocus. The G2 is quite quick and accurate as well as having an incredible lens lineup. I think you'd be hard pressed to find a smartphone that has a better lens than that 45mm/f2 planar
That being said street photogs dont just use specific cameras. You can use whatever you want as long as you're fast enough with it
Nobody is stopping you from using a phone or forcing you to use a leica it's just fun to use whatever feels good
I've got a g1 with the 28mm/f2.8 biogon and it's great but I've never shot street though