1080P versus 4K - Will I notice a difference (short distance)

[DINOP 0]

I have another question.  I know that 4K is better than 1080P however I found a camera that fits my needs except it is only 1080P

The distance I am looking at is 20 feet or less for this camera and I am wondering if I would notice a difference for this short distance using 1080P and not something with a higher resolution 

[Benson Chiang 0]

Whether you see a big difference will depend on the size and resolution of the screen. If the monitor is only 1080p then you will not get much of a benefit unless you use digital zoom in which case the 4k camera will allow you to zoom in further before you get pixilation.