Quote - ...no., I checked. it's 1 Meter.

Citation needed, as they say on Wikipedia. None of the OBJ file specs I can find mention a scale, but most of them are apparently copied from the same source. Yet again the Internet fails to be the sum total of human knowledge...

But seriously, I'd like to know. If most modellers export a 1 metre cube as being 1 OBJ unit on a side, then I can update my dissertation with that information. I don't have access to most modellers - at least not the ones which are expensive enough to work in real-world units. :)