Do Al Pacino and Dustin Hoffman not like eachother?

I was reading on wikipedia about al pacino and it said that his rivalry with dustin hoffman is well doented..yet i try to look it up on the web and see the details that are so well "doented" and all i keep getting is "his rivalry with dustin hoffman is well doented" well, does anyone know if they like eachother or hate eachother or its just a little friendly rivalry or if its serious.........?