Sigma 28-105mm f/2.8 weights under 1kg and has 82mm filter size

Image on top shows the Canon 24-105mm f/2.8 lens (the Sigma will be a tiny bit smaller and lighter) In early September, Sigma will announce its new 28-105mm f/2.8 lens for Sony E and Leica L cameras. I am told that the weight of the lens is less than 1 kg. This is considerably less…...