I have been a Canon photog for many years and now have purchased the Sony A7rii. Purchased an Sigma MC-11 mount so I can use my Canon lenses on the Sony. Some features of the lenses work on the Sony, but not all. The adapter increases the flange to focal plane distance, and not sure if this affects the quality of the image. So, for the next lens purchase, I have to make a decision. Do I buy it for Canon and use the adapter to the Sony, or buy the lens for the Sony and skip the Canon? It is nice to best of both worlds, but under the current technology, this is not happening. One option is to just use the Canon lenses for the Canon and purchase new lenses for the Sony without having to use an adapter. Any photogswith experience on this issue?