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So I am on my second copy now. I did a brick wall test, and at 24, neither of them are as sharp as my 24-105 in the far corners, but both are better in the near corner. the second copy is actually even worse in the R side and right upper corner at 24, slightly better at 35. Its funny b/c I think all the tests done by the digital picture, dxo, dpreview etc, check the lens in studio at close focus distance, where the sharpness is much better in the corners. I am starting to think this is...Show more →
You could try placing focus a bit deeper or somewhat shallower than with the 24-105 and see how it works then for distant scenes. I'm surprised to hear the Tamron 24-70 VC might be worse thant he 24-105 since I had a nasty time getting 24-105 to fit real world distant, complex landscape scenes (my tamron 28-75 2.8 actually behaved better), but it could be and if so then especially glad I got the 24-70 II (although I am a bit troubled that ALL copies I tried placed DOF differently compared to each other copy, often noticeably so copy to copy to copy; my current copy is generally superb but I feel it probably slightly pushes back the plane of focus at the bottom left and brings it slightly forward top right, but otherwise excellent (and for scenes not having very deep upper right or near lower left it is 100% crisp corner to corner on 5D3 at 24mm) and the f/2.8 center frame performance is outstanding, best of all the copies, already noticeably sharper 70mm f/2.8 center frame than the 70-200 f/4 IS or even 70-300L IS are at 70mm f/4).