Here's what I think about it. fast accurate autofocus, accurate color reproduction like on an Elk, can be viewed here http://fotki.
Canon EF 40mm f/2.8 STM Lens - Fixed Black (6310B002) for US Cameras
76 Review
Black Canon EF 24-105mm f/4L IS II USM Lens - Model 1380C002
78 Review
New Nikon 18-105mm Vibration Reduction 📷 Zoom Lens with Auto Focus for Nikon DSLRs
104 Review
Nikon 35mm f/1.8G Auto Focus Lens for Nikon DSLR Cameras - Black (Model 2183)
125 Review