http://briansmith.com/field-test-sony-a7rii/
Only mention of non-native lenses:
In my brief tests with Canon EF glass using Metabones, FotodioX and Viltrox Smart Adapters, AF is considerably faster than previous a7-series cameras. Not only is Continuous AF-C tracking possible with the lenses I tested – it’s fast! I’m waiting for a production a7RII with release firmware before I run more extensive tests to update my Canon EF Smart Adapter Compatibility Guide.
Only mention of non-native lenses:
In my brief tests with Canon EF glass using Metabones, FotodioX and Viltrox Smart Adapters, AF is considerably faster than previous a7-series cameras. Not only is Continuous AF-C tracking possible with the lenses I tested – it’s fast! I’m waiting for a production a7RII with release firmware before I run more extensive tests to update my Canon EF Smart Adapter Compatibility Guide.