It has been confirmed that the Sensation has two different LCD panels. One made by Acer (AUO) and one made by sharp. The sensation does not have a good screen bad screen issue. Some people prefer the acer screen and others prefer the sharp. I have had both and they both are really beautiful displays. You can only really tell the difference if they are side by side.
To find out which panel you have:
Use terminal emulator (free from the market) and run the command dmesg (root is not needed obviously)
it will output a bunch of stuff.. look for this line and report it: (if you can't find it you can long press on the output in terminal emulator copy all and then paste it into an email and send it to yourself)
just look for the line (the numbers might not be the same) [ 9178.895111] Panel Type = PANEL_ID_PYD_??????
Mine is sharp so my line is Panel Type = PANEL_ID_PYD_SHARP
If you have searched and can't find reboot and try again.
Pics I took of the two side by side:
AUO on left/top Sharp on right/bottom: