The method in that Steam link certainly works, games looks stunning with 4xMSAA turned on as well. If it didn't work for you I would start over and go step-by-step through it again as it should work.
I used the STALKER compatibility settings for the best quality and the game still runs at a smooth 30fps with every setting on max. That's on a rather high-end PC though.
I tried it repeatedly last night, but couldn't get it to work. I'll try once more when I get home from work this evening. BTW, did you have to turn off HDR or change your resolution to get it to work?
