I was wondering if I just wasn't very sensitive to tearing, because I haven't noticed it. One setup is a 4K 46" or Dell 30" next to a 4K laptop, the other is 4

I was wondering if I just wasn't very sensitive to tearing, because I haven't noticed it. One setup is a 4K 46" or Dell 30" next to a 4K laptop, the other is 4K 46" with two 1080P wings in portrait.