This lens is great. It is rated 4.98 out of 5.00 for sharpness by Dyxum (4.96 overall). It has a macro limiter and a built in retractible lens hood. The focus is fast and accurate. It is an a-mount lens that I use directly on my SLT-A77V and with an LA-EA4 adapter on my e-mount cameras A7R2 and A7R3a.
Here are some professional reviews:
Phillip Reeve
Dyxum
Imaging Resource
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