I just found this thread. I own six eink readers which include three Kindles including the new Graphite DX model. I also own two Ipads.
The new Graphite model is using a second gen eink screen. I was skeptical of Amazon's claim that this new "Pearl" screen significantly boosted contrast and readability.
OMG! I was wrong. The new DX is significantly better than previous Kindle or Sony eink screens. It is simply astounding. Crisp, sharp black text on a nice whitish (versus grayish) screen. I love technology and this is a real improvement over earlier screens ( and I liked those since I had five units!).
Now as far as readability. I can read without issue on the Ipad. It does not produce eyestrain for me and the glare is a non issue.
But...the DX Graphite produces a far far sharper screen/text and is much more like reading text on paper than the Ipad. The earlier gen of eink was not this good. Side by side the superiority of the DXG is clear.
I love my Ipad and use it daily. I will continue to read magazines and comics on my two units. But non-illustrated books go on the DX Graphite. NO contest.
If you have the cash, spring for both and have the best of all worlds.