This is the spot focused upon using Live View.
The distortion of the 16-35 is substantial at 16mm, making it hard to figure the best match (since it varies across the frame). In this example, the 16-35 enjoys a 3% magnification advantage at center, which means it’s about 6% larger in area there. At the edges it’s about 0.6% at the edges (linearly), or about 1% larger in area.
At f/4, both lenses are excellent, exhibiting very nice micro contrast. The 14-24 declines slightly from there, but the 16-35 maintains a very high level of performance. The difference between the two is most notable at f/8. While some of the difference can be attribute to the 3% magnification advantage, not all of it can.
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