I happen to have these two wines just days apart.
1983 Chateau Raymond-Lafon, Sauternes
Medium dark gold. apricots, peaches and honey on the nose. Apricots, pears, and honey furit flavors, surpisingly high acid, and a long fruity finish. This wine still tastes amazingly youthful, with high, lively acid. I’m guess this will continue to hold and maybe even improve slightly. My rating 89.
1983 Chateau Rieussec, Sauternes
Very dark, amber golden color. Deep aromas of apricots and honey. Apricots, pears, peaches, and honey fruit flavors, good acid, and a long fruity finish. A delicious Sauternes. This wine is not getting any better, drink up. My rating 91.
These are both very good, mature Sauternes, but the Rieussec is clearly the stand out of these two, with deep, more intense fruit flavors. On the other hand, the Raymond-Lafon seems like a young Sauternes with many years ahead of it, while the Rieussec seems fully mature.