The Tamron lens has a longer range of focus ring rotation, 146° vs. 97°. The Sigma lens is not weather sealed. While both lenses have the same list price, the 7-year-older Sigma is seeing decision-factor-strength instant rebates at review time. With a primarily Canon kit, I next wanted to see the awesome Canon EF 35mm f/1.4L II USM Lens compared. Canon announced the new EF 24-105mm F4L II IS USM lens (Amazon/Adorama/B&H). Mark Goldstein tested it on Canon EOS 5D Mark IV and found: It is a new professional standard zoom lens for Canon’s full-frame and APS-C DSLRs, much better than the 10-year-old Canon EF 24-105mm f/4L IS USM lens. CNGdalB.