but I can't say I have ever seen any reviews/comparisons either. I wonder if that means it is a minor consideration of image editing? I can't say.

Can you answer your own question? How does it compare for you?

I did see this though; http://www.cambridgeincolour.com/tutorials/image-resize-for-web.htm , and a bonus, they state, "Genuine Fractals 4.0 was included for comparison".