I would say since most lie angles are ridiculously upright as it is and most iron lengths are longer than old standard (which makes them more upright as well) that the lies tend to get flatter.
I went from standard to 2* flat. Also, how stiff the shaft has an effect on it as well.
I agree with Jim that the lie angles are too upright for most sets made today. Mizuno's lie angle is 2 to 3 flatter than most other manufacturers. My ballstriking improved immediately after switching to Mizuno irons that were 3 degrees flatter than the other manufacturer's typical lie angle.
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