If you're watching movies, sd/hd channels, playing games, viewing media(pix, videos, widgets, etc) then you won't even notice anything at all. The only time I noticed was when I connected the MacBook Pro through to an HDMI display port. I didn't set the label to PC yet. You do see some artifacts against text and you do have to look at it closely to see them. After setting the label as "PC" for the HDMI input (the screen will quickly flash to black and switch to this mode), no sharpening problems appear. Even in the non-PC-label mode, I don't even mind it and will probably will not notice it if I didn't know about the post-processing.
The PK950 has a lot of text on the menu UI and interestingly there are no artifacts apparent on the text. Good news but strange and I just assume that the text content on the UI menu are probably images. I hope this helps.