The 7DII quite likely has the same feature as on other recent bodies, where you can configure the Set button to zoom to 100% at the AF point selected for the shot, then zoom out/in with the main dual. I far prefer that to a bunch of button presses.
Hard for Sigma to reverse engineer the AF system of a camera before launch. That's a downside/risk with 3rd party lenses. If it's a bona fide issue, Sigma should have a firmware update for the lens at some point.





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