View source for Lentils vs second-hand soy

If people switched from...
* a typical western diet where much of the protein comes from '''animals fed soy'''
...to...
* similar diet but the animal proteins are replaced with '''lentils''' (same ''total'' amount of protein)
...'''would it use less crop land?'''

Because on one hand, farm animals are inefficient protein converters. But on the other hand, lentils are lower-yielding than soybeans (both in terms of protein ''and'' calories). So what would the estimated overall effect be?

==Consensus==
{{empty}}
==Answers==
{{empty}} {{talk|TODO: gather data on feed conversion ratios (protein and maybe calories), and gather data on crop yields (check FAO data maybe). But is it best to use "global average" yields, or country-by-country? Gotta decide}}