Clay Zamperini wrote an answer about Five Ten Arrowhead Climbing Shoe on July 8, 2011
Ok I'll answer my own question. The Arrowhead runs bigger than the Blackwing. A 10 in Blackwing fits perfectly, and a 10 in Arrowhead fits about a half size too big.
So here's a reference chart for some Five Ten fits (for a street size between 10 and 10.5:
Blackwing - 10
Arrowhead - 9.5
Coyote - 9 - 9.5
Supermocc - 8.5 - 9
Moccasym - 8.5 - 9