I have been following the Quad Warp corner pinning thread(s), and I decided to try this myself. I grabbed the DSLR and pointed at the TV screen and walked a little side to side and tracked with the Htifilm point tracker.
The Quad warp edges are not anti-aliased or it is a little weak so I tried to add a feather to the edge with the Matte Cleaner effect. The feather is not really what I would call a feather, but it seems to be magnifying the aliasing edge. Thus making it more apparent.
Here is a video showing what I see on my machine. I removed the background video and replaced it with the plane. All you see is the quad warped screen replacement and that is a still image. You first see it without Matter cleaner feathering. Then with 5 pixel feathering and finally with 50 pixel feathering. The later really (excessively) visibly shows what is going on even with the 5px feather. At 50 It is in your face.
Here is a project which was used to create the above video. It is just a Hitfilm project and the jpeg. A 500K DL. You will have to relink the jpeg on import as your folders are not the same as mine.
HF 4, update 1
Windows 7, i7 4770k 4Ghz, 16GB, AMD 7950 GPU 950Mhz, 3GB, driver 15.11 (current)