For the best shave...is it neccesary to finish with the 12.000 thousand grit stone? is it going to add a sharper edge? , is it the 12.000 thousand grit purelly for cosmetic purpouses? please help, i have the norton 4/8 and not getting quite there, need to know if to buy the 12 or not.
Thanks for your time and help.

Sergio.
classicaly shaving.....