Keep the Oly 17mm 1.8 or the Panasonic 20mm 1.7?

I was hoping to get some opinions on what to do. I have a panasonic 20mm 1.7 that I've been using for a while, and I just bought an olympus 17mm with the intent of replacing the 20mm. I've been happy with the 20mm except the focusing can be slow and I get noticeable banding at ISO 3200. Since this is a low light lens for me both issues crop up often.

Having now had the chance to play around with both lenses, I've got to decide which one to get rid of and I'm on the fence.  The panasonic is without a doubt sharper, is a bit lighter and smaller, and is roughly $200 cheaper. The Oly has better build, much faster focus (can be jumpy though), and has what I would consider acceptable performance and no trace of banding.

Once I get past the pixel peeping, I think for my purposes, the faster autofocus and lack of banding are probably more important to me than outright picture quality. However a big part of me feels like returning the Olympus just out of principle because it is priced at a premium, and the optical performance seems a little lower than the 20mm.

What would you guys do?