I am not sure how much advantage the “Authorship” adds to the blog, but most certainly it is beneficial.
I recently implemented it and I see many top bloggers have implemented this on their blogs. One difference I found is, Google enabled Site Links right after I implemented Authorship for my blog. Therefore, I highly recommend it and I see some benefit of this for sure.
Thanks for the post. Enjoyed reading and feel great leaving my feedback.
Regards,
Kumar