Implementation of IFRS 9 became effective on January 1, 2018. There may be some anecdotal evidence of its impact, however, scholarly research of its effects is probably too soon to tell. The results generated from IFRS 9 will be compared to IAS 39. There is some literature that studies IAS 39 impact. See:
Article Reclassification of Financial Assets Under IAS 39: Impact on...
Article The impact of IAS 39 on the risk-relevance of earnings volat...
Article The Amendment of IAS 39: Determinants of Reclassification Be...