Dunno if it was mentioned previously but seems hit sounds are in =]
Also some info on the MG zoom dmg thing

"One thing worth mentioning is that the standard-equipment multiplayer machine gun is a lot more effective than the one from Quake III, and there were many situations in which I found myself forgoing a more powerful weapon in order to make use of the powerful-if-dead-on machine gun. EDIT: Raven has informed me that when unzoomed the machine gun operates the same as it did in Quake 3. When zoomed it does slightly higher damage at a slightly lower rate of fire. Plus, it's just nice to hear that dull bell sound again and again and again."

Source