On that same (zoo bird) example, set them both to medium, and BPG looks much better to me, the crown feathers are smooth and clean, and the background is a plea

On that same (zoo bird) example, set them both to medium, and BPG looks much better to me, the crown feathers are smooth and clean, and the background is a pleasant gradient, while in JPG it is horribly blocky. Even bumping BPG down to small still seems better than JPG's medium. I think the hope is that soon browsers will implement BPG themselves, so no javascript will be required.