Image quality results from a second lens copy have been added to the Sigma 150-600mm OS Sports Lens review page (full review coming soon).
The first link shared in this post compares the latest-tested lens ("2") to the prior-tested lens ("1").
B&H has the Sigma 150-600mm OS Sports Lens available for preorder.
Addressing an FAQ: Will the Sigma 150-600mm OS Contemporary Lens Be Tested?
Absolutely. At just over half the price of the Sports model and at about the same price as the Tamron 150-600mm f/5-6.3 Di VC USD Lens, the Contemporary lens holds a lot of interest. A great feature is that it can be found in stock.
A retail copy of the Sigma 150-600mm OS Contemporary Lens is scheduled to arrive today. Test results should be available in the near future.