Henry is not so much a writer as a reporter

not so much…as (或not…so much as)的意思是“不如…那样多”或“与其说是…不如说是…”
翻译为：与其说亨利是一个作家不如说是一个记者.
再举一个例子：They weren't so much islands as sandbars．与其说那是些岛屿,还不如说都是些沙洲.
注意与“(not) so much as”前者意为“甚至不”或“甚至…都没有”区别开来