This image is a simple one, yet serves to illustrate both field curvature as well as color aberrations and sharpness across the field. Image made on the Canon 5D Mark III.
As a side note, the Canon 5D Mark III sensor is amazingly noisy at ISO 100 with a 1/2 stop push. The whole image has a gritty/grainy feel to it. It is why I greatly prefer my Nikon D800.
Field curvature analysis
The entire frame is shown further below under the color fringing analysis.
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