Ace's and Tech Report have already published benchmarks comparing all three processors (Athlon64 FX, Athlon 64, Pentium 4EE) along with several older cpus. I have to admit, I am very impressed with these new processors as they make very impressive showings.
http://www.aceshardware.com/read.jsp?id=60000253
http://techreport.com/reviews/2003q3/athlon64/index.x?pg=1
http://www.aceshardware.com/read.jsp?id=60000253
http://techreport.com/reviews/2003q3/athlon64/index.x?pg=1