There's a huge segmentation in the Android OS versions distribution and updates never come soon enough - there's little to dabate here. Every now and then, however, a new distribution chart comes out so we can muse on the trends and numbers. The latest edition puts Oreo at just under 1/5 of the market (19.2% total between v8.0 and 8.1), a 4.6 percentage points increase from the last time we checked. Nougat's piece of the pie is still the largest, but there's a slight drop (29.3% vs. 30.8%) so a bit of the Oreo gains have probably come from updates, not just new releases. Speaking of...
Source: https://www.gsmarena.com/still_no_pie_in_the_android_distribution_chart-news-33519.php