Definitely impressive. This breakdown for World was posted earlier in this thread:
PS4 version 8.7 mi
PC version 5.9 mi
Xbox version 1.8 mi
It will be interesting to see how Rise's sales compare to the PS4 version (8.7m) and also PS4+XB1 (10.5m) of World. It's making really good progress so far in not too long a period of time.