Being in the usual situation in which I am able to still watch the Angels and Sox on ESPN (usually it will be blacked out if it is on our local FSN West) and since I also get NESN through EI I tried to watch the game through NESN. Since the Angels are playing the NESN feed was blacked out. I tried the game search feature and it took me to the mpeg4 ESPN feed on the test channel 9323. I am able to switch back and forth between mpeg2 ESPN on 206 and mpeg4 ESPN on 9323 and I can see a definate difference in PQ.
The blur is from the camera, not the TV or PQ. Remember, my camera is not HD, but to get an idea, look at the ESPN scroll bar at the bottom. On channel 206 the edges on the text are not as defined and sharp that close up. On the test channel the edges on the text in the scroll bar as crisp and clear even looking at the TV very close up.