How far can a normal user see an opponent? A radius perhaps would help.
If someone who acquires a sniper gun that can shot a player from 800M then I guess this will make the game pretty much harder for someone who only have a handgun.
You will be able to see as far as your eyes can see. During testing with bots, we currently show the distance to the bot above the bot's avatar. But whether this is part of the game or not, depends on feedback from initial testers.
Of course it will be difficult to hit someone with a sniper rifle from a very long distance, you will be able to zoom with your scope but if that opponent can move fast enough, you will struggle to hit them! That is a good question, will the best sniper beat the fastest pistol warrior? We'll have to find out