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metichemsi At least with chroma key you could get pretty good sharp edges, as long as the scenes were filmed a good distance away from the greenscreens, but alpha pack has these annoying blurry edges that still annoy me to this day.
You probaby know this already, but to help clean up the edges of Alpha Packed scenes, in Heresphere under 'Advanced Video Settings / Environment / Mask (Alpha Packed - Cog).
There is an 'Opacity Multiplyer' option, i think the default is 1, try changing it to 1.5 up to 2 or mess about with it to suit tastes of each scene.
I personally find it cleans up the jagged edges quite nicely and helps with blur.
Hope that helps a bit.