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as mentioned the sigma art series in particular is excellent, and in general sigma glass is good, i think the knock on them used be be good glass but cheap construction, not sure that is the case still...sigma will also be releasing an e-mount adapter, it only works for sigma (canon & sigma mounts - no nikon) lenses but it will supposedly have allow all native functions unlike other adapters:
That would be awesome because I've been on the fence with metabone and their shaky AF but this looks to be more solid and even cheaper.