It's not just chromatic aberration. It's also blurry because of distortion from the (very simple) lens. Even high-quality lenses cannot reproduce the image shar

It's not just chromatic aberration. It's also blurry because of distortion from the (very simple) lens. Even high-quality lenses cannot reproduce the image sharply across the entire plane; they're noticeably softer in the corners for example. In this case their simple lens (akin to a Lensbaby) results in zoom-like blur in the corners and thus more extreme PSFs than the Canon lens, which has more or less the same PSF shape overall, just wider in the corners. Also it appears that they used 32 wavelengths for computing the PSFs in the simple lens case vs. just three for the Canon lens.