I believe it has a lot to do with the paper you use. There is no doubt the OEM pigment black ink is the best. I have used a lot of different pigment black ink from many sources just for the reason of finding one that matches OEM as close as possible. I have not found one. However, it is not difficult to just print on a paper that works better. The Hobbicolors PMT-BK is way better than the majority that I have tried. The difference with OEM is really not much at all. But if you use a magnifier to check the prints you may find that OEM has an edge. I have not tried KMP pigment black ink. Many have recommended it on this forum. If it is that good it will be still only an edge over the PMT-BK. It's not worth the cost to use it for printing what's coming out of googling and stuff that will go to the recycle bin in a couple of days. But if I were to print a resume or something of that nature I will not print on copy machine paper. I will print on cotton bond paper. In this case PMT-BK is absolutely good enough no question about it. I use a magnifier to double check it all the time. I know what I am talking about.