I think there is a bigger difference than lesser/butter, mystic/phantom, bp/cinny etc.
Sugars tend to have a reduced pattern with gold/orange outlines and a higher White that "melts".
Calico's with the exeption of the odd really nice f&f example are no where near as nice IMO.
Low White calico's look like normals, lower white sugars have a lot of orange and crazy patterns.
This is my sugar.
http://i755.photobucket.com/albums/x...an/null-15.jpg
These are 2 of her siblings.
http://i755.photobucket.com/albums/x...an/null-14.jpg
http://i755.photobucket.com/albums/x...an/null-13.jpg
(breeders pics)
I think sugars are worth the higher price tag.