A trusted source of knowledge and opinion, Walt Mossberg from the Wall Street Journal's All Things D handles the Apple iPhone 5.
...I still consider the iPhone  the best smartphone on the market, especially with its staggering 700,000 third-party apps and a wealth of available content.
via All Things D
As of 2100 EDT on the 14th of March, the media embargo from Apple was lifted and the reviews are in. Everyone LOVES the Retina Display and LTE. I might as well reiterate it again; EVERYONE LOVES THE RETINA DISPLAY!!!
Truth also be told, I'm glad I went with the 32GB Verizon model and can't wait to pick mine up on Friday. Some have already asked and yes, I might end up asking if I can up it to the 64GB version being that applications are coming in weighing at at least 1.5 times the size and some even up to 5 times larger! Here are a couple of snippets from the sources that I believe run true to the way that I analyze new hardware, tech and software.
"...it just looks otherworldly; like a glowing piece of paper." - Joshua Topolsky; The Verge
" The new iPad is the most functional, usable, and beautiful tablet that any company has ever produced." - Joshua Topolsky; The Verge
"It has the most spectacular display I have ever seen in a mobile device. ... Using the new display is like getting a new eyeglasses prescription — you suddenly realize what you thought looked sharp before wasn’t nearly as sharp as it could be." - Walt Mossberg; WSJ: All Things D
"Since it launched in 2010, the iPad has been the best tablet on the planet. With the new, third-generation model, it still holds that crown." - Walt Mossberg; WSJ: All Things D
"Reading on the big retina display is pure joy." - Jon Gruber; Daring Fireball
Here's another close up from The Verge on the difference in screens of non-Retina vs. Retina.
"This is the tablet you want." - Brian X. Chen; The Wirecutter
"The bottom line is that it's the best tablet and everyone who reviews one agrees. And even people who love Android phones kind of can't say much about how Android tablets stack up against the iPad. And unlike with computers or stereos or cameras, you don't really need my help, or anyone else's help, to understand that. So, I will end here." - Brian X. Chen; The Wirecutter
"So, what did I like about the iPad? Simple — the experience. Nobody in the market today can touch the Apple experience." - Jim Dalrymple; The Loop