Can not understand what he means when stating that aperture priority always gives a 1/60 sec shutter speed. It will if the correct exposure is 1/60 at whatever aperture is set. The answer: set a larger aperture. I use aperture priority all the time (most of the time) when using manual focus lenses on my Nex 5 or EOS M and have no problem with the camera setting the correct shutter speed to suit the light. When a manual focus/aperture lens is used the camera automatically changes the shutter speed (or ISO, if set to do so). Of course the A7 may operate in a different manner to the NEX.
A 28mm lens on any APC sensor camera makes for a perfect standard lens. The only problem I have found with my Voigtlander 20mm SII lens on my Canon DSLRs is the fact I have to crank the focus back from infinity a smidgen to sharpen the photograph.
ybizzle: Near Leica quality without the Leica price! ;)
Although it is a 75mm lens, it is not a portrait lens. It would be if the sensor was full size but it's not. This lens is a medium long telephoto, portraits with it will look a bit squashed.
The Sony 5N shows the leica a clean pair of heels, albeit with an adaptor Sony lens. Big price difference.