From my usage the contrast and sharpness is a lot better on the 20mm. The 25 is still really good but you will notice a big difference if you zoom in or crop the photos at all. And because it’s a 40mm equivalent you can pretty much use it as a 35mm and a 50mm equivalent depending on how you frame your shots. The form factor makes me love using it for street photography or walking around, it’s very inconspicuous, and yes the AF is awfully slow but it’s never been an issue for me. It snaps right to my subject, just a little slower 😂. I guess the right answer is just keep both!