N.B. Just to answer some questions I'm getting on Google+ here is a recent exchange.
'How well does the Sigma 20mm perform on the A7r? Especially in the corners.'
'It's actually very good. Significantly better than the Sony 28-70mm FE zoom and also better than some raw samples I've seen from the 24-70mm which has poor corners and some distortion. Also a lot better than the Sigma 12-24mm which is poor in the corners as well.
They haven't tested an a-mount versions but here's a DxO comparison with Nikon mount versions on a Nikon D800 sensor. As you can see it gets a higher score than the Zeiss 21mm. http://www.dxomark.com/Lenses/Compare/Side-by-side/Carl-Zeiss-Distagon-2.8-21mm-ZF2-Nikon-on-Nikon-D800-versus-Sigma-20mm-F18-EX-DG-ASP-RF-Nikon-on-Nikon-D800-versus-20mm-f2.8___334_792_900_792_216_0'
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