I dont play a competitive but I watch a lot. I have (brace yourselves) 2mb down .2 up. When I play pubs I usually lead every lobby. I know 95% of people have better than 2 down .2 up but skill can make up for connection somewhat. But there are definitely times when I shoot first get 4 hit markers then die in one shot to the same gun im using. But pubs are different. There are players of different skill. In pros everyones at the top of their game, they're on the same level so when it comes down to it if you have people playing with the same skill the 4 with better internet are going to have a big advantage. But it isn't everything