Yes, a lot.
In my lab my Zigbee network "fight" vs. 3 bluetooth network and I can barely communicate at 1m distance. Comparing to my collegues I can say that zigbee suffer of interference much more than bluetooth does, also speacking with other engeneers they told me of severe decrese in communication when a bluetooth device enter in the area of their network. There are some paper describing coexistence with other protocol (see MC13192 section)