No Market Share movement for Drupal 8 yet sorry.
Get a list of 187,638 websites using Drupal 8 which includes location information, hosting data, contact details, 73,669 currently live websites
and an additional 154,063 domains that redirect to sites in this list. 113,969 sites that used this technology previously and 31,190 websites in the United States currently using Drupal 8.
Distribution of locations of all Drupal 8 customers we've ever tracked.