The goal of this study is to assess differences that still exist in International Financial Reporting Standards based financial statements between otherwise similar firms. We undertake this study because one primary goal of IFRS is to enhance comparability of financial statements world-wide, but it is unclear to what extent that has happened. First, we assess whether different countries adopt different versions of IFRS. We find, adopting countries fully adopt IFRS with only minor alterations to IFRS as promulgated by the International Accounting Standards Board. We then test whether otherwise similar firms, but from different countries, interpret IFRS differently. IFRS is a principles-based set of accounting standards, and thus offers a wide array of options for companies to choose from in their reporting. The latitude of options in reporting inherently creates room for differences when firms interpret IFRS for their own financial statements. Building on prior studies (e.g., Ball (2016), Nobes (2011)), we find that historical country GAAP is influential, and in documented instances constrains comparability of otherwise similar firms located in different IFRS adopting countries. Based on our findings, we then offer suggestions to preparers and users of these financial statements, and the IASB, to address financial statement comparability issues (see appendix C).