I assure you, I've explored every avenue; even at 514x514, the effect appears distorted.
Let me clarify, the icon file is flawlessly designed at 42x42, in line with all other icons:
Image:
https://www.dropbox.com/s/fph2i4gc3jik99u/KFC.png?dl=0
Please, let's not point fingers at the designer - I happen to be the designer, boasting over 20 years of experience. I wouldn't be raising these queries if the issue lied in the file size.
Nevertheless, I appreciate your screenshot. It further corroborates the issue with the icons not maintaining a 1:1 aspect ratio as they were originally designed to.
In this screenshot you shared, I've copied the 42x42 icon from the right side of your Lister and juxtaposed it with the icons you've utilized. As you can see, the resolution doesn't hold up to the sharpness of the original 42x42 from the right side menu.
Here's the upscaled version for a better view:
Image:
https://www.dropbox.com/s/0t1ptx5atjhax0d/1b.png?dl=0
So, let's set the design discussions aside for a moment and concentrate on determining why the icons are not preserving their intended 1:1 aspect ratio.
Also why the KFC icon with the black KFC text inside it looking while after using as an icon?
I can take a closer look into icons you are using vs total commader view and check if those are scaled correctly, but my problem is having them look 1:1 as designed.
Thanks guys and have a nice day/night

Adrian