How to get best quality screenshot out of UE4?

I get issues all the time when I’m trying to get high quality screenshots out of UE, I need a solid approach to export best quality images without any transparency or any rendering glitches for artwork publishing reason, please help. Thank you!

You have here full solution:

It works great, you can add custom multiplier, so it’s not connected with your screen resolution or GPU - you can create much bigger screenshots, for example 4K.