IMac Retina maximum resolution is it really 5 K ????

I currently own an iMac 27 inches 2011.
Since my pictures are 36 Mpx, I thought it would be nice to upgrade to the Retina new model.
iMac 2011 resolution is 2560 x 1440 which is 3,686,400 pixels
iMac Retina is 5120 x 2880 which is 14,745,600 pixels
So the new iMac has a resolution that is 4 times the one from my iMac 2011
So I should be able to see 4 times more pixels than before when I display
a large image at 100%.
So this afternoon I went to the Apple store with my sample.
A JPG picture 7360 x 4912 pixels = 36,152,320 pixels.
I had 2 iMac side by side. One non Retina and the new Retina.
The new Retina was set at the maximum resolution.
We launched Preview on both iMac and selected Actual size on both machines.
The new iMac offered a little bit more image like 30% more but certainly not 4 times !
I had 5 Apple store staffs around me who did not know what to say.
They acknowledged their was a problem and explained to me this was linked to the software.
Stupid answer. As if the screen resolution was dictated by Aperture or iPhoto...
To please them we tried both software and got same results...
So my question is simple.
With a screen offering 4 times more pixels, shouldn't I expect to see 4 times more
data from a picture displayed at full resolution ?
Thanks
Thierry

depend on the program in question various image programs start with various different settings in terms of best fit zoom or the likes
1 to 1 pixel display is an option in some such programs

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