I have used Yonka for many years in my younger years. It is an excellent product but I don't they good enough (rich enough) for aging years. That is my opinion. I also have very dehydrated skin so I need something rich and powerful to keep the moisture and help in the hydration to prevent wrinkles and fine lines.
I decided to go with the Yonka. I;ve used the Phyto 52 once, than started on rosehip, hazelnut and emu oils. But now I will start using the Elastine Nuit than go back to the phyto 52 after that. And your right, Yonka is an excellent product.