Hi there don't mean to be rude or anything. It might look superb but its actually just one persons opinion. Lots of people in the LCD\Plasma forums would disagree completely with that.
Its more down to the quality of your display than the number of pixels.
Obviously 1080p will look better than 720p on the same display device. But 720p on a decent display could quite easily look better than 1080p on a cheap display device.
And thats the whole point. You want the best picture for your money, and that "graph" does nothing to help except that it looks pretty and interesting.
Just my POV though obviously
But its based on owning a few different plasmas, 1 good one and 2 poor ones. They all have their strengths and weaknesses and one thing I've learnt is the number of pixels, unless your comparing exactly the same model but with a larger screen size and hence more pixels. Say a 720p panasonic to a 1080p panasonic in the same generation.