This particular project didn't require any art direction (e.g. providing alternate croppings at different viewports), which is a big component of Picturefill and the picture element. Our only goal was to reliably provide high-resolution images to devices that had a high-resolution screen. Srcset provides a simple, straightforward way to serve up the proper assets to high-resolution devices. The best part of srcset is that it falls back to a normal image if the browser doesn't support the syntax, and support is only going to get better. For a deeper dive on srcset and Picturefill, check out Jason Grigsby’s post over on the Cloud Four blog.
The Responsible Compromise