77% of respondents thought it would be more than a merely noticeable difference.
ALmost everyone think it will at least be a noticeable difference.
And about half think it will be a difference between the sun and a moon. If you grew 8 cm, how would life change for you if you are slightly above avg?
I cant imagine how it is like for 8 cm, but at 5 cm+ I think I get looks from people thinking why my legs are so long (I cover them up but I guess they do look pretty long.. and its manly!)

I think the worst thing that can happen is calves that are longer but very very thin, devoid of fat and muscle.

Long and muscular calves look good!