It's OK you can stop being smug now http://wwf.panda.org/what_we_do/footprint/agriculture/soy/impacts/
At a guess, far more soy per cup of coffee would be used per cow-cup-of-milk (an actual SI unit, if I recall) that per cup-of-soy-milk.
@NotThamesWater started
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It's OK you can stop being smug now
http://wwf.panda.org/what_we_do/footprint/agriculture/soy/impacts/