I am not sure how to put this forward without sounding like a fan boy but I am going to try. Most of my lights are of reputable brands either made in the USA or designed and sold in the USA, of which in my unprofessional opinion, those I find spotting the toughest HA would be those from Surefire and HDS. Unless I drop the light on a hard surface, there's no way I would see any wear on the HA at least for a few months of hard use. A Surefire M2 I have since 2002 still has it's full HA coat on with only a small nick on the bezel where I last dropped it. To be fair, I holster carry the M2 instead of putting it in my pocket with all the coins and keys.
Some lights made by the Chinese manufacturers exhibit, again in my unprofessional opinion, some of the poorest HA around with some wearing off even from normal use. My Quarks have been kind of iffy if that's the right word, some of the Quark's HA seemed to last quite well whereas some wears off just in a few days of usage. I wasn't expecting a miracle for the price I paid. I am just stating what I had experienced. Zebralights however seemed to be very well made. I have trashed them in the bag with some hard objects like fork and spoon plus other camping peripherals and they seemed to hold themselves quite well. Wasn't too impressed with Jetbeam but I can't say that I had bought enough Jetbeams to give an unbiased opinion of them. Nitecore seem to have one of the worst HA I can find, more like type 2 anodize instead of type 3. I am not sure what are the experiences some of you might have but these are what I had felt and experienced with these lights.