Leica 24-70mm f/2.8 Versus Sigma 24-70mm f/2.8: Is There a Difference?

While reviewing the Leica 24-70mm f/2.8, I was able to spend some time with a lens from Sigma that has been accused of being the exact same lens in a rehoused body. But is it? Editor’s note: The following evaluation is meant to be viewed after reading the full review of the Leica 24-70mm f/2.8, […]