Not sure. Could be or could just be only Sony could get them to work. Whichever way it's good news for anybody swapping systems or want to use Nikon or canon glass.It's strange that it is Sony who makes it all work, rather than updates from the adaptor makers. Does that mean Sony has either locked it out until now and saw the Canon/Nikon Adaptors works better so they thought they must do something to improve the ones on their mount even if it is made by a 3rd party?
Or it's just co-incidence.