George Ratliff’s “Joshua” took the grand jury prize for best feature film at the first Gen Art Chicago Film Festival.Kurt Kuenne won for his short film “Validation.” “Joshua,” which goes into limited release this week, has been warmly received on the fest circuit. Fox Searchlight bought it at Sundance for $4 million. The five features in the Gen Art festival screened June 26-30 in Chicago. This is Gen Art’s first fest in the city; the group held a similar confab in New York in April. “Numb,” written and Directed by Harris Goldberg, took home the Audience Award. In addition to film, the group produces fine art, fashion, and music shows in various cities. The feature winner gets a $10,000 prize, while $5,000 goes to the maker of the best short.