to be successful, need good (if not great AF) and an adaptor (already have this, but needs to continue to work) for EOS EF and EF-S lenses.
Why would I want to use BIG/HEAVY DSLR lenses on my mirrorless cameras?? When I dump my DSLRs the lenses will go as well. For me, NO adapter wanted or needed. YMMV
+1...faster AF and more pancake lenses, not the bulky stuff.