Techart updated their Contax G to E-mount autofocus adapter firmware to support the full 399 phase detection autofocus system of the new Sony A7rII. You can get it here: techart-logic.com/2015/DL.html.
Chad Wadsworth already tested the new version and there is on bad and one good news:
Bad news: “I’ve found that when attempting focus at the minimum focus distance (MFD) of each lens, the adapter will hunt badly and worse, slip into a contrast detection mode that will continue to hunt when focused at longer distances.”
Good news: “On the upside, the 90/2.8 is very fast to focus – as fast as my Batis 85/1.8 and is sure footed, finding focus in situations where even the Batis struggled. Truly remarkable.”
You can find the Techart Contax to NEX adapter on eBay (Click here).
These are the Contax Full Frame lenses you can use on the A7-A7r-A7s and APS-C E-mount camera with full autofocus and electronic aperture control:
Hologon 16mm; 1:8 on eBay (Click here).
Biogon T* 21 mm; 1:2,8 on eBay (Click here).
Biogon T* 28 mm; 1:2,8 on eBay (Click here).
Planar T* 35 mm; 1:2,0 on eBay (Click here).
Planar T* 45 mm; 1:2,0 on eBay (Click here).
Sonnar T* 90 mm; 1:2,8 on eBay (Click here).
Vario-Sonnar T* 35 – 70 mm; 1:3,5-5,6 on eBay (Click here).