I am really intrigued by the focus capabilities and the AF hit rate I am seeing from the A7RII. If I were to buy just the body and the Metabones IV adapter, would I be able to get a good feel of how well the focusing is, just using my existing EF lenses? Or would I need to probably invest in a native E-mount lens to begin with? I could see myself slowly migrating over to the Sony system and picking up some native lenses, if AF, and image quality are as good as the reviews say.
Also, how is the high ISO performance of the A7RII compared to the 5DIII? Is is similar?



