I have other knives in AEB-L, but as you stated, not really able to directly compare for greater/lesser edge stability, retention, and toughness.
There are a few variables among differing makers that can't be ignored, such as their target hardness range they want (I've not confirmed the hardness of any of my other AEB-L knives), I don't know how the other makers heat treat and temper, if they apply edge bevels with benchstones or power tools. Plus other factors that could skew or create anomalous behavior.
My empirical, garage-science type practical experience has involved these 2 blades the most (I just picked up the sheepsfoot this week):
The white corian paring knife has a sheath for belt carry, but I've left it in the kitchen. Has not really become dull in my kitchen/house use, and I've polished the edge with high grit diamond paste and currently it's very sharp, especially as it came with a very nicely applied apex at the edge bevels, to begin with. But, I don't use it on ceramic or glass ware, I don't throw it in the sink and my wife does not use it, so it has not had to hard of a life, yet.
The knife on the left, with orange, I've used in some more rigorous chores - several passes/feet of various thicknesses of cardboard, cutting up dirty p-cord, cutting up old dirty tarp material, shaving fatwood into a fine pile for fires in the backyard. While still possessing a good working edge and because I like sharpening knives, I freshened up the edge with a couple of minutes of edge leading passes on a Spyderco medium benchstone, few minutes on a Spyderco fine benchstone, quick strop on some 1 micron diamond paste loaded on a flat block of Bass wood, and finished by a quick strop on naked phone book paper tightly wrapped around a coarse Norton benchstone. Pretty quick work to bring the edge to quite sharp, without even raising a burr.
Currently, the knife easily and gently shaves hair off my arm. Based on my practical use only, the edge stability and heat treatment seem good enough as the edges have not evidenced obvious deformity when running a finger nail along edge or by observing with my naked eye, edges have not dulled noticeably quicker in my use and experience, as compared to other AEB-L blades. Plus, the only edge I've lightly worked on, respond well to the sharpening done at the time, but I did not need to raise a burr, so that experience is yet to come.
I am satisfied and would by more, as I've clearly done.
Thanks for asking and I hope that there is some useful context in the above response, to your questions.