The "standard" lens to use with the A7R is a 35mm f/2.8 Carl Zeiss lens. While it isn't cheap, it produces some wonderfully sharp images, while the out of focus areas are rendered beautifully. The black and white has been created in camera here.
The A7R's large sensor is capable of capturing stunning detail.
As of now, there is only one proprietary lens recommended for use with the A7R, but more are on the way. I got the chance to use a production sample 55mm f/1.8 Zeiss lens that should be available to buy in the new year. Check out the beautiful bokeh in the background of the shot.
Shooting at high sensitivities, such as ISO 3200, reveals some image smoothing and loss of detail, but overall it's a very impressive performer.
The 28-70mm f/3.5-5.6 lens isn't available as part of the kit for the 7R, but you can use the lens as a carry around lens to get you started.
The large sensor on the A7R makes shallow depth of field effects easy to achieve. This was shot with a 55mm f/1.8 lens, which is not available to buy just yet.
The A7R, and the A7, is a good camera for street photography work.
You can adjust colours in camera, but still retain a "clean" version of the image for use later. This the monochrome setting.
Use the DRO Optimiser to produce more balanced exposures in areas of high contrast.
Colours are represented well by the A7R.
Generally, the metering system on the A7R does a good job to produce balanced exposures.