I have a virtually new Planar 50mm I am looking to sell. Originally bought for the NEX 7, and rarely used. Purchased an A7R and a 55mm with it, and no longer require this lens.
The lens itself it every bit as sharp as the 55mm Sonnar from my experience, which itself rivals the 50mm Otis! The Planar seems to me, to have better color and contrast than the 55mm Sonnar. If you like to manual focus, it's a no-brainer.
Aside from being incredibly sharp with great color and contrast, this lens is like new. Virtually no wear aside from one microscopic spec between the first elements which was there when I bought the lens. It will in no way affect your images.
The Lens comes with both a B+W Pro UV protector filter, and a B+W Pro Polarizer, as well as a screw-in metal hood which allows you to use the hood and polarizer at the same time (bayonet hoods to not allow this).
New, this lens alone costs $859USD. Another $120 or so for the filters and hood. I am asking $700USD, firm.
I also have a Novoflex E-mount adapter I will sell for $220 ($270 regular).