Q4Max adds many features and fixes to Quake 4, making it a much more enjoyable and complete game. For this reason, most servers running Quake 4 are running Q4Max.
This image shows the Q4Max scoreboard in the Duel mode, which shows the weapon stats for the two players, highlighting which is better for each weapon.
This screenshot was captured from a Q4TV broadcast of an ESWC tournament game between PURRI and forever.