well i'm an event videographer mostly weddings
and im interested little bit in quality and i was confused between EX1 and Z7 and i think i will go with z7, can anyone give me some hints

1/2" vs 1/3" - completely different lenses. Non removable vs removable - record to cards only vs tape and/or card - XDcam vs HDV about $1500 (US) difference in price. Different post (edit) workflow depending on your NLE.
Both have been pretty extensivly reviewed here at DVi. I would suggest that you spend some time going thru the various threads and reviews to see which might work best for you.

Don