Frankie sez:

  The higher the bars, (for
a given COG height) the longer the "lever" you have when exerting force to
lean the bike.  The same goes for the seat for the forces exerted from
leaning one's body weight.

So if you have two bikes with the SAME COG and the SAME moment of inertia,
the bike with the higher seat and bars will seem to lean from side to side
more easily.

ooooooooooooooooooooooooo

This assumes that you are leaning the bike over with your weight.  If
you are counter steering ( at over 20 mph or so), the forces arising
from the gyroscopic action of the front wheel as it is forcibly
twisted about its axis will lean the bike much more abruptly than
just using your weight to lean the bike over. And if you slide the
tubes up in the triple clamps an inch or so, changing the front end
geometry, it will roll into a turn even faster. Been there, done that.

Skinny Kenny