Recent research conducted as part of the English Profile identified grammatical criterial features that are characteristic of each Common European Framework of Reference (CEFR) proficiency level. The extent to which these criterial features attest in English learners of various first language backgrounds call for an empirical examination. In this study, I investigated the use of the criterial features drawing upon a Korean EFL corpus. Data consisted of 6,486 essays produced by 3,243 Korean college students from A1 to B2 CEFR proficiency levels. I examined how 35 criterial features which pertain to levels A2, B1, and B2 attested in this corpus. Overall, although more frequent and wide use of the features was observed as proficiency level advanced, the features occurred in low frequencies. I also found some misalignments between the criterial level of the features and learner proficiency. I discuss the potential influence of first language, test and task type, and rating on the findings of this study. Moreover, I raise the need to reconsider the criteriality of the identified features depending on the context when adopting and applying them in local assessment contexts.