Here are stacked bar charts of the number of characters who own weapons with item levels of at least 500. These charts roughly represent the distribution of jobs used in the end-game raids as of patch 5.3.
Reference All data is taken from the 5 December 2020 Lodestone Census (Lodestone国勢調査) by Lucky Bancho. More information can be found on Lucky Bancho's blog at https://luckybancho.ldblog.jp/archives/55274008.html