And why are they exactly the same in sharpness, despite one being smaller than the other?
The Retina display is BETTER than the screen on the Nexus because the average person cannot discern the individual pixels on the iPad screen. The ppi on the Sexus is not enough to qualify as a Retina therefore the average person CAN discern individual pixels. Period. End of story.
app store I could see Android dominating the tablet market since it lets you do way more things and is a step closer to having a 'replacement' to a computer than an iPad. I still like webOS for a tablet than any of the others. If it had been released today & way more polished it might have had a better chance.