Hmm.. I think there are some other things to take into account.
First of all the grass in the screenshot from ROF is continious and this is not the case for the picture taken in SOW, which is broken by the hangers cement runway. So it is easier in the SOW shot to see how each individual grasstexture looks. Find a picture that shows the same in ROF and I think they will look almost alike..
Secondly the screenshot from ROF is much smaller than the one from SOW, which in turn blurs out the detail. Also there might be anti-alias on the screenshot from ROF which it clearly is not in the SOW screenshot.
Just my 5-cents..
