Yes the Koni's lower it more than standard.
The day I did mine, these were the measurements, measurements from floor to highest point on the wheelarch.
Front was 664 mm which went down to 625 mm (39 mm)
Rear was 648 mm which went down to 628 mm (20 mm)
The photos I took at the time definitely showed the effect, but the quality is not good enough to post as it was with a new camera!!
Over the next thousand or so miles, it has settled further, the back has gone down a bit and the car looks level now. I guess I should get the tape out and re-measure now.......
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ST-24 Saloon, July-1999, Silver, no bodykit, no mesh
My 96 SE measures at about 658mm front, 656mm rear at stock ride height.