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I'm on F-springs with stock shocks and the ride got slightly stiffer after. But after a year, it's now at where it was before the installation. Very happy with the look and feel. Can take most driveways without worry.
Agreed, similar observations, slightly stiffer.
My IS is on Eibach 350's (same as F-Sport springs) with stock sport package shocks.
My personal experience is the H&R spring/stock shock > H&R spring/F-sport shock for ride quality and my preference. I'm waiting for my f-sport shocks to die before switching back.