I realize this is an old thread, but I ended up here so I thought I would add some valuable information for others who wander into here.
I thought I would recommend knifesteelnerds.com. It's the site for Dr. Larrin Thomas, metallurgist and creator of Magnacut steel. His website contains a wealth of accurate information about knife steels. He has several books if you really wanna geek out on knifesteels and the knife engineering. He also has a youtube channel that contains a lot of information in a more digestible form if you prefer,
http://www.youtube.com/@KnifeSteelNerds.
I have read so much incorrect inforation about knife steels and sharpening over the years, but you can trust the information from Dr. Thomas. There were also some misconceptions about Damascus steels that were widely trusted as fact by most of knife industry, which were proven incorrect by the research of Dr. Thomas.
Having read over the thread, I didn't see anyone mention that coatings on a blade commonly require heat to apply, which results in a slight tempering of the steel reducing it's hardness. So a non-coated blade will typically have a better heat treat, therefore better edge retention. Of course, this can be a positive or a negative depending on the use of the knife. If it a hard use knife, you might want to give up a little HRC (hardness) for a little increase in toughness. There are so many variables in the steel on a knife, so for breivity the best advice I can give anyone is pointing you to Dr. Larrin Thomas to continue your education on the subject. These days there are also many knife reviewers with youtube channels that can provide a wealth of information as well, just don't believe everything on youtube. There's a lot of misinformation as well. Do your own research and verify the information.