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Agreed w/ OP. The pixel density on my iP4 is AMAZING/ PERFECT/ SUREAL! I got my new iPad 2 days ago, and while I like it, the IP4 "retina" display has spoiled me.
 
The retina display is good, but it certainly doesn't replace the iPad for a lot of things. I'd rather use the iPad for Web Browsing as the retina display makes everything sharp but oh so tiny. I have to blow up to a portion of the web page to read some of the text with 20/20 vision. On the other hand, the iPad has very easy text size, right from the start.

So for me, it's awesome pixel resolution for the size making things pretty in that space, versus usability.

Then comes the apps that make use of the iPad screen size for multi-panel controls. iPads apps often have pop-up panels/windows and all kinds of helpful interface features that make them a lot more like desktop applications. And all of that, while being very easy to hit with your finger. When web browsing, I have to zoom a lot more with the iPhone to make sure I hit the right link or button.
 
Definitely using the iPad less since i4, partly because the screen so nice, partly because the iPhone runs snappier, partly because Safari on the iPhone can handle more open windows without as many refreshes, but most of all, because I'm not as worried about ending up with a dead iPhone battery if I use it instead of the iPad. Still loving the iPad though.
 
I'm now SO used to (and impressed by) the iPhone 4's amazing, beautiful Retina Display that when I switch to my iPad, it's like... night and day. It's like going from a beautiful crisp device that looks like e-ink or colored paper, to a device that doesn't look like that. It's like going from from Jessica Biel or Jessica Alba to Rosie O Donnell in the same night.
I love the retina display too, but I still heavily use my Ipad every day and flinch at the thought of labeling my Ipad "Rosie O'Donnell." The Iphone is more Jessica Biel/Alba to the Ipad's Mary-Louise Parker. Is Mary Loiuse Parker a bit older and not as "perfect"? Maybe, but she's still hot as hell and, frankly, I kinda prefer her most of the time, but I still like to spend time with "Jessica," my Iphone.
 
I bought an iPad 3G a couple months ago, and got my iPhone 4 at launch. Initially, I also found that the iPad was harder to look at after getting spoiled by the iPhone 4's Retina Display. But I'm used to the difference now, and for me the two devices compliment each other very well.

First off, the proper viewing distance for an iPad is quite a bit more than the iPhone. You just don't need the iPad so close to your face. Once you increase the distance a little, you'll notice the pixels fading from view and the whole experience will be better. So my suggestion with the iPad is to sit back, relax, and read it like a book. Blow up the font a little if you can, and increase the viewing distance. You've got more screen real-estate to work with, and a larger display. Use it to the fullest.

When I'm watching a movie, reading a lot of web pages, or doing a significant amount of work, the iPad is my go-to device. I can't imagine watching a full movie on the iPhone anymore, even with the Retina Display, unless it's all I have with me. Sure, I've got a few good movies on the iPhone to show it off, and maybe watch a favorite scene or two, but for extended viewing, there's no question that a 10" display beats 3.5" display. And the iPad still does have more total pixels.

I also still find web browsing much better on the iPad. Sure the Retina Display lets me see the whole page legibly now, but I'm still going to be pinching in and out to tap buttons and do any serious reading. With the iPad, I just browse.

Typing is also easier on the iPad, and when I'm doing serious content creation, I bust out the Apple Wireless Keyboard.

Though when I'm out and about, I often leave the iPad behind unless I plan to do serious browsing or work. In those situations, the iPhone 4 is terrific enough to make me not miss the greater roominess of the iPad so much.

I also segregate my apps between devices to some extent. There are some apps I have on both, but in many cases I just go to my iPhone for certain things like Yelp and Twitter, and reserve the iPad for more heavy-duty functions and certain games. I don't try to have both devices do everything. Also, on the iPad it often makes sense to just use the web browser for things that, on the iPhone, are better in a dedicated app. Facebook is a prime example.

Lastly, I occasionally find myself multitasking to another level with both devices. For example, I might be writing a draft report on my iPad, and viewing a related email or reference document on my iPhone.

Having both devices doesn't make sense for everyone, but it sure does for me.
 
Nuts, simply nuts. The iPhone and the iPad are two devices with two different purposes. Sure, there is a lot of overlap but no matter how clear the iPhone display, the iPad wins hands down for functions like reading books, browsing web sites and viewing video.

I like both devices and use them appropriately for any given task.
 
the ip4 screen makes lots of things look bad, i went on my friends 3gs the other day and i couldnt believe that only a couple of weeks ago i was using it and how outdated the screen looks.

anyone who says that the retina display isnt fantastic is very wrong imo
 
To each their own, of course, but IMHO if a person finds browsing or reading or even viewing pictures on the retina display more enjoyable than on the iPad, I submit they are doing something wrong.

As an analogy, consider those OLED TVs...amazing picture crammed into an 11 inch space. What good is that? Despite what our ladies tell us, sometimes size does indeed matter :D
 
There is absolutely no guarantee that it will have a retina display....

I seriously doubt it will.

A retina display on an iPhone simply brings the total resolution closer to what you find on a basic desktop LCD. Current high end CPU and graphics processors for mobile phones can handle that. But a retina display on an iPad would involve more pixels than even a high-end digital projector at a movie theater. There isn't a mobile CPU, battery, or enough RAM to drive something like that.

I'm sure Apple is toying with ideas, but don't expect them to do anything soon.
 
My main problem along these lines is which is the greater piece of equipment. I use them both equally, each for a certain use. The best one seems to be the one I can get to the fastest.
 
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