Nikon changes the focal range of the new 18-140mm f3.5-5.6G DX VR lens, making it easier for beginner-photographers to tell it apart from previous models. Why are we talking about this lens? Because it has been reviewed at DSLR Bodies.
Dxomark is back with another lens measurable evaluation. They zoom zoom this time and do the heavy lifting for the Sigma 150-500mm f5-6.3 APO DG OS HSM, with lots of comparisons included in the aforelinked review page.