This should clear up some confusion about time to kill being longer in this update, the time to kill on all weapons bar snipers at close range is far far quicker, it may seem otherwise but this would be a placebo effect.
From this update most weapons receive a significant buff and new game play reasons to use different weapon classes have been introduced.
Shotguns are now much better for close quarters combat because they do x1 damage in all hitboxes or 1.2 at close range.
Rifles and pistols now do much higher damage in all other hitboxes where previously they only did 0.5 unless you managed to get a headshot.
Snipers still deal x2 damage to the head, but do less at very close ranges to encourage people not to use this class of weapon where it would not realistically be used and to introduce new gameplay measures.