Comparison of 2 EF 16-35mm f/2.8L II Samples

When corner sharpness of version II of the EF 16-35mm f/2.8L in my initial tests gave slightly lower corner fine line resolution than the first version of the lens, there was concern that I may have tested a bad sample of the version II lens. A forum member sent me a copy of their version II lens to test. Sample 1 is the lens I own and tested in the review. Sample 2 is the lens that was loaned to me to test.

Lens sample Date code Manufacture date Serial #
Sample 1 UW0603 June, 2008 1184023
Sample 2 UW0603 June, 2008 1146842

Line Resolution at 16mm and 20mm settings

Performance of the two samples of the EF 16-35mm f/2.8L II is comparable. There is no data to support a conclusion that Sample 1 used in the tests is defective or dysfunctional.