During regular gameplay, according to the event graph, about 20 to 25% of my hits client side are not counted server side. Additional to that, there are cases when an entire magazines does no damage or cases where hit registration already fails client side. This goes as far as seeing rockets phase through tanks, or connect with an explotion, but dealing no damage, though the issue is more prevelant on high rpm weapons.
It is harder to test but there are definite cases of getting shot by enemies without line of sight or even already defeated enemies.
I am playing at a 20 to 30 ping and have no other network issues, also all of these issues do allign with the experiences of friends who are playing this game on different servers (i am in the center of the EU, but i have seen the exact same issues for players that are spread out across the US).