Fair point Roger but it probably means we both think there should be some sort of "industry standard" for measuring area of sails.
Even within the same manufacturer there are discrepencies (accross models)
Checked daughters 4.7 expression against combat 5.0.
If anything exp is bigger ! (in measuring Exp is 1.9% shorter in luff but 1.7% longer in boom) Plan shape identical.Combat slighly higher aspect ratio.
Then again exp is supposed to give good bottom end power; it does again because it measures big.
I`d bet there just isn`t a sail renowned for good bottom end power which measures "small". (ie smaller than quoted area)!