Not many at left-back, but when taking out the Juve bias and taking in the past 3 seasons aswell, Felipe Luis, Marcelo, Alaba, Rodriguez and Alba all rank in the top 5 with him. But when you really think about it, not one has their stock so high as Sandro right now and I wouldn't take any one of those names over Sandro. Only Luis outranks him defensively but no one offers the same balance in both halves of the pitch.
In the first half of the season he was our best player along with Higuain.