The easiest way to test your lens is to test Live View vs Viewfinder AF. If it still is a difference then you should send it for calibration.
The biggest difference between the 17-40 and the similar-focal-length-covering 16-35 L is price. The 17-40 is much less expensive - practically half the price. But of course, the 16-35 is able to let in twice as much light. See the Canon EF 16-35mm f/2.8L II USM Lens Review for a comparison to the newer 16-35 L Lens version.
Or with the difference in price between the 16-35mm 2.8 vs f4, you could buy the samyang 14mm and the 16-35mm f4 for a cheaper price than the single 2.8. Probably a better idea, I'll go with the f/4 and the rokinon /samyang. I use the 16-35 2.8 II on a mk III body and it's pretty good for astrophotography but I'm planning on switching soon to
has a silent focus motor built into the lens. Canon EF 16-35mm f/2.8L II USM. Sigma 14-24mm f/2.8 DG HSM Art. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance.
Canon EF 16-35mm IS USM -Video Kit LED KIt Monopad - 16GB Accessory Bundle Canon EF 24-105mm f/4 II IS L USM Lens PRISTINE!!!! THIS IS A VERY SHARP LENS!! $10.50
Review manufacturer specifications and detailed lab measurements for the Canon EF 300mm f/2.8L IS II USM Lens. a1, a7R V, a7 IV, FE 16-35 II, 70-200 F4 II, 200
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canon ef 16 35 2.8 l ii usm
