According to Eupedia :
"Most K1a4, K1a10, K1b, K1c and K2 subclades are typically European. K1a1b1a and K1a9 are found primarily among Ashkenazi Jews. "
23andMe :
"A few branches of haplogroup K, such as K1a9, K2a2a, and K1a1b1a, are specific to Jewish populations and especially to Ashkenazi Jews, whose roots lie in central and eastern Europe. These branches of haplogroup K are found at levels of 30% among Ashkenazi. But they is also found at lower levels in Jewish populations from the Near East and Africa, and among Sephardic Jews"