Nikon is the most used camera in North Korea in 2021 according to this article published on a media outlet specializing in North Korean topics: Nikon is the most used camera by the State News Agency KCNA. Although the article is paywalled, here are two tweets published by NK NEWS:
“North Korea’s favorite camera appears to be the 2014 Nikon D750, which was used to shoot 656 KCNA images last year according to EXIF data […] The top five cameras used by KCNA are all Nikon DSLRs, responsible for 2,066 of the 2,504 shots from 2021,” writes Ángel García.