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Notes:
Photographic Dynamic Range and DxOMark Landscape Dynamic Range are very similar measures.
Because different criteria is used they report values that are about 3.24 EV apart.
The gray line indicates a perfect match and the dotted lines are plus/minus 1/6EV from perfect.
The 3.24 EV figure holds well for Nikon and most other brands.
Canon and Sony values fall below and to the right because of the shape of the Photon Transfer Curve (PTC) in the region of interest.
The Sony A7S and Sony A7R in particular have much better PDR with respect to Landscape Dynamic Range.

Further Reading:
Sensor Analysis Primer - Engineering and Photographic Dynamic Range
Sensor Analysis Primer
DxOMark Landscape Dynamic Range (DxOMark site)

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Contributions of data are always welcome, particularly if you see an (e) after your camera or your camera is not listed.
Contact me if you wish to help.