I'm curious to know the RDC-measured stiffness of an Asian K Factor Tour 90 (AK90). Posters have compared it with the US K90 in old posts - some say it's about the same, others say it's more flexible. I think it's difficult to compare stiffness when the frames are so different in static weight and swingweight. Has anyone put an AK90 on a Babolat RDC to measure stiffness? Or does anyone have the RDC + AK90 to do it? Short of that, AK9/USK90 users now have several years of play with these frames. I'd be interested in hearing any updated impressions of how these frames compare in terms of stiffness.