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I'll try kicking this off myself.

• Photoshop built-in (Image Size - Preserve Details) appears to be doing a bicubic resize followed by a smart sharpen

I haven't tested this comprehensively but it doesn't appear to preserve edge detail from the image.

• PhotoZoom Pro can 'hallucinate' detail

Looking at the examples, something strange happens to the hair in the corner of the face example and the depth of field in the shell example creates an unexpected pattern on the rock it's sitting on.

I notice that PhotoZoom Pro has a whole host of options so it may be possible to compensate for this.