what makes it more of a mobile workstation, different cpu, nope, more memory, nope (actually less), workstation gpu, nope, it is simply filled with the same kind of parts, general/gaming laptop hardware so there is nothing about it that makes it more of a mobile workstation than the 15.6" MSI, just larger and heavier, the MSI even has a second bay for another internal hard drive so that isn't even an issue either
and about the quality of MSI products, you know who makes the mac motherboards, Foxconn, which is IMO rated quite a bit lower than MSI if you want to go buy desktop motherboards
as for the screen, yeah you can't get it matte, but if it is anything like the screen on my compal laptop, it is better quality (in terms of color representation and sharpness) than the 15" MBP's, keep in mind the screen is 1920x1080 so it only loses a little more resolution compared to the 17" MBP (120 pixels in height), it is just smaller making it sharper and the laptop smaller and lighter
the only thing the MBP has is battery life which isn't even their once you spend the $100 to find a 12 cell battery for the MSI