I have not seen a review on the 5900 camera either.

Here is a "Preview" that includes a great deal of information:

http://www.digitalcamerainfo.com/content/Nikon-Coolpix-5900-First-Impression-Review.htm

The A95 has more manual controls:
Shutter Priority
Aperture Priority
Full Manual

The 5900 has a large number of scene modes.

Finding out the largest memory card that they can use is very difficult.
The manufacturers do not include this information in their specifications.

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