In 2014, The Guardian columnists Sean O’Hagan and Jonathan Jones revisited an old question: is photography a fine art? According to Jones, a photograph could never compete with a painting on a gallery wall. But O’Hagan argued that it didn’t have to—photography is its own medium, independent of other art forms but no less worthy of recognition. In the five years since that debate, fine art photography has made its mark on established institutions and up-and-coming galleries alike. Historic museums…