Screen resolution will not change the area view that you have. Meaning you wont see more of the game you are playing. Screen ratio may change that.
I have always had a 16:9 monitor. But I would think different resolutions will help you in different ways. A widescreen monitor with a ratio like 21:9 could let you see more of the battlefield side to side. A square ratio like 4:3 may let you see more top to bottom, but less side to side, etc. There is a streamer here that runs 21:9 streams once in a while you can check out.
You could test this yourself by changing your game resolutions to different ratios. Remember the screen will not be made for these resolutions, so the picture may be weird looking and blurred. but it will show you how much more/less of the game play area you will see at those ratios.
Full HD is 1920x1080 pixels and 16:9 ratio. 4k is double that resolution at 3840x2160 pixels and is still 16:9 ratio. You will see the same amount of game/map area. It will just look sharper.
What 4K brings you over Full HD is:
- Less need to run anti-aliasing.
- much better detail in textures.
- slower FPS (unless you trade Anti-aliasing).
AA - In order to get rid of jagged edges on objects, you need to run anti-aliaising. AA, paints extra smoothed/averaged pixels along edges to give them a more realistic smooth edge. There are many AA modes and each has trade offs for killing FPS. Running higher res such as 4k, means edges look smoother just because there are more pixels, so you dont need to run as heavy AA or even any at all.
TEXTURE DETAIL- When your videocard paints a wall/floor/etc on the screen. It calcs the angle it is rotated to your eye. If there are not enough pixels on the screen to draw the whole texture, the card will use a smaller blurred copy of the texture. Running high res like 4K, lets the videocard use more full resolution textures and the result is a lot more detail and sharpness. To see what games look like without running smaller blurred textures (MIP MAPPING) see any game written to run without videocards and watch the pixels at angles dance around like your LSD has not worn off yet.
