By assessing player skill instead of just Better dps ? You must be the better player ! For example , a very , very basic way of doing this would be to sim both of your characters on simcraft and divide this potential dps by how much you actually did . So for example if he simmed at 350 k and you simmed at 300 k , and you actually did 290 k and he did 310 k , you preformed at 96 . 6 % of optimal while he only preformed at 88 . 6 % of optimal . The more involved , but obviously better , way of doing it is to compare logs . You can get as involved as you want with this . You can either go bigpicture and look at very broad things like number of spellcasts shows movement efficiency or if you want you can get really down into the details and observe someone ' s entire rotation by looking at every single spell they cast .