Basically, i think kose sekkisei range emulsion,lotion)are much better than sk2 treatment range(facial treatment cleanser,clear lotion,essence).Here i try comparing in a basic daily care(cleanser,toner,mosturizer).
Even after reading so many reviews about sekkisei and sk2, sekkisei still better.mostly fit to various skin type.as i remembered, i read somewhere saying that sk2 targeted to 35 yrs and above.but im not sure about that.