The 2016 vintage was awarded 95 points and a Platinum Best In Category (Best New Zealand Sweet) at the Decanter World Wine Awards (www.decanter.com): see their August 2017 DWWA supplement (see blue link below).
We have tried and tested both the 2015 and 2016, having been fans of "The Agnes" for a good while. It is our strong opinion that there is nothing to choose between the 2015 and 2016 if you are not willing to wait for the 2016 to arrive (or even if you are).
Seifried Sweet Agnes Riesling 2016 - August 2017 Decanter review
This is special stuff. Made with extreme care by Seifried in NZ’s South Island, the Sweet Agnes is pure, late-harvested Riesling: left on the vine, the grapes gain even greater ripeness, lose moisture and so become incredibly sweet (the wine’s sugar content is ~180g/litre). It’s almost amber in colour, and its flavours include lemon sherbet, marmalade, tropical fruits and butterscotch. It’s quite irresistible on its own and delicious with fruity puddings or tangy cheeses (particularly blue cheeses: it really is amazing with these).