In comparing the Sony PRS-505, (I have one) and the GDX (not a picture of the GDX), I'm here to tell you in side by side comparisons the GDX blows it out of the water. The lightness of the background on the PRS and the GDX are pretty darn close I'd say almost identical. But the text on the GDX is much darker and sharper. And I happen to agree that the 505 was the standard by which all the others where measured against, and always wished my Kindles could be as good. Well This one's better. I can't begin to tell you how happy I am with this thing. And I'll be buying a K3 to replace my K2 as soon as it is announced based on what I'm seeing here.