None of the figures provided mean much unless you know several more variables.
a. Do they review each picture? Or is it turned off. Do they chimp to review and for how long?
b. Do they use the menus much?
c. Do they use IS/VR lenses and how long does the person stay "on target" with the IS/VR activated before taking the exposure?
d. Length of exposure.
e. Are they using onboard flash?
f. How new are the batteries and have they been exercised properly and regularly?
g. What temperature are these people operating in?
There's more, but until you know at least the above information (and half of it would be hard to provide accurate figures) you can't compare one against the other. I regularly got 2500-3000 images from my Canon 1ds2. 6 years later the same batteries provide 800-900 frames. At what points during that 6 year time frame did I get certain numbers? And how did my shooting style, seasons of shooting, choices of lenses, etc, affect those numbers? My Canon 5d2 gets 1800-2200. And so on..
If the information isn't accurate enough to be transferred and compared directly to your style you're guessing.
It might be better to study the spec sheets. See how much a camera draws, how big the batteries are, and investigate each cameras "potential" for all shooting scenarios.
But if you're really worried about running out of battery after a long extended off the grid excursion.. then don't think about carrying a ton of batteries, or a certain camera, etc.. really, most modern cameras draw the same and the batteries for DSLR's are all very close in capacity. Instead, carry one battery, a space because batteries do suddenly fail completely, and lightweight foldable solar charger. You can make a fairly nice system for about $100. Depending on how you travel (treking, you'll want to sew a place for it on top of your pack), campsites (a method for propping it at the best inclination/direction, and so forth.. A solar charger will charge your phone, Ipod, and whatever else you deem necessary..
If you're just interested in 'an' average number of shots per camera.. go to DPR and they tell you in each review. If you want more data, read more reviews. But getting the information off the forum with little to zero consistency in user habits.. it's not worth much.