My 2001 diamondtron 2020u with a lot of use still display high resolutions extremely sharp, so that's not true for what I've seen. The thing is that this 2070sb is almost new, it has only 2500hrs on his tubes and was made in 2005, it should be on his prime. It's not like it's all blurry, it's really sharp at 1600x1200@85hz, but having the 2020u side by side makes me realize that it's not as good as it should.Diamondtrons are known to become blurry with old age, especially in the corners. I've seen a few of them behaving this way especially with increasing resolution/frequency. My guess is that the issue comes from the electronics and the aging of some components. I'm not sure if it can be entirely fixed with settings.