No Market Share movement for Drupal 8 yet sorry.
Get a list of 176,904 websites using Drupal 8 which includes location information, hosting data, contact details, 216,790 currently live websites
which includes 145,323 domains that redirect to sites in the list. 105,437 sites that used this technology previously and 30,474 websites in the United States currently using Drupal 8.
Distribution of locations of all Drupal 8 customers we've ever tracked.