Canon EF 16-35 USM III vs USM II

[cgennoe]

This question is straightforward:

There is a significant difference in price between these lenses:

How significant is the difference in picture quality?
Under what circumstances does the USM III outperform the USM II and how dramatic is that difference?

I supposed there may have been a similar post created already, or a good article online that I haven't been able to source online.

Thanks a great deal in advance!

 

[TCampbell]

You might want to read the articles in the LensRental blogs:

Canon 16-35mm f/2.8L Mark III Optical Bench Tests

Real World Testing of the New Canon 16-35mm f/2.8L III

They really seem to love this 3rd gen lens.

 

[Shuiyin]

Thanks for the references to the links. I'm debating about the 16-35 as my next purchase.

 

[fotografdenunta]

You should look at the corners, version II is blurry. You must shot at f5.6 to get good corners with the old lens.