I have some more... Groundwork this time.

http://www.geocities.com/pharsti11/gw1.jpg
http://www.geocities.com/pharsti11/gw2.jpg

Asuka is rediculously flat here, where Rei is a bit bigger :(


EoE shots:

http://www.geocities.com/pharsti11/eoeasuka.jpg
http://www.geocities.com/pharsti11/eoerei.jpg

It's the opposite here :/

The funny thing is, those Groundwork artbooks are supposed to be
production sketches for EoE, yet the breast sizes vary greatly. I
guess it just goes to show that they likely never had any specific
sizes to work with in the first place. And judging from Der Mond and
the manga, Sadamoto draws them pretty much equal.

So in the end, I doubt the creators gave the whole breast issue much
heed. And I don't think we should either, btw. :)