When do you use hipfire??

Only when people walk "through" me, or they're close enough for me to knife them.

I prefer to ADS in every other situation.

Got to disagree there Bob...render distance is fine for hip fire. fact!

Pretty much all of the time. If I can't hit them hipfiring I don't bother shooting.

If you have a gun with a small CoF and high RoF, hip firing gives you a nice advantage over someone that ADS because the TTK in the game is so short. While you waste those precious milliseconds to ADS, I'm getting headshots.

I hipfire if they're too close for my 4x scope to be a viable option

Step 1:
Take a weapon with with good close-range hipfire CoF (f.e. TAR, Lynx, Jaguar, or any kind of SMGs) attach a (advanced-) laser sight on it.

Step 2:
Aim for the head /upper torso

Step 3:
Watch their heads melt off their shoulders