The Sony RX1 and now the new RX1R are great walking around cameras. I've had a chance to try the RX1R for a few hours and am loving the size of the camera, the layout of the controls and the image quality.
Similar to the RX1 in use, I find it great for landscapes and urban shots and hope to try it more on the street.
I did grab these two shots yesterday while walking around with both the RX1 and RX1R cameras.
This is the full size file from the RX1R
My retail store for rangefinder gear and Zeiss lenses is www.rangefinderstore.com
My retail store for large format photo supplies is www.bigcameraworkshops.com