This is a big deal. The Hamilton King Award is technically given to the best painting throughout the SI annual, as judged by past Hamilton King Award winners, but it has also come to signify something of a mid-career achievement award. Past winners include Bernie Fuchs, Leo and Diane Dillon, James McMullan, Mark English, Gary Kelley, Bob Peak....basically a "who's who" of illustration since 1965.
The award ceremony will take place in June in conjunction with the Illustrators Fall of Fame inductions. I'll be sure to post about it here.
Cheers, Donato!