That said, there are not many FF ultrawides that behave well all over the field until stopped way down. Remember the 17-40L or Sigma 12-24 II tests where the quality drops off the cliff towards the corners at the widest settings - most good APS-C UWAs don't have that sort of behavior (for example the Sigma 8-16 seems much better in this regard than its full frame cousin). The choice is up to the user. However, in the Canon scope, the new 16-35/4 IS seems to change the game quite strongly......
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