Helicon Focus crashed on me so it is out of the competition. For this comparison, I picked this succulent with overlapping leaves, as most of them have. The first image from Photoshop shows what the problem is. The next images show Zerene Stack and Digital Photo Professional doing a somewhat better but not perfect job. Look at the part of the leaf just left of center and you will see Photoshop haloed with a hard edge. Zerene handled that part of the image very well, but has some dark haloing in other parts of the image. DPP has softer haloing than Photoshop but overall did not do nearly as well as Zerene. It appears to me that Zerene, which used JPGs as source files, does not have the color and contrast of the other images.
Some of the blurred foreground leaves can be fixed in DPP, but the halo that affects background leaves can't be fixed in DPP. Focus bracketing seems like such a simple concept but a foreground image covers a bigger area when blurred than when sharp, and there's no easy way around it.
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