Here's what I wrote two years ago, when the iPhone 5 shipped:
> There is no argument that some people really do like these big
> closer-to-5-than-4-inch Android and Windows phones. I was in a
> Verizon retail store yesterday (long story; don’t ask) and
> overheard a relatively small woman buying a Galaxy S III. A
> companion asked if she wasn’t worried that it was too big, and she
> said no, big was exactly what she wanted, because she doesn’t have
> a tablet and wanted to do a lot of reading on whatever phone she
> got. She even said she was thinking about the 5-inch Galaxy Note
> (which Verizon doesn’t carry). It was like a conversation out of a
> Samsung commercial. Such people surely think the iPhone 5’s
> display remains too small. But, trust me, there are going to be
> many long-time iPhone users complaining that it’s too big after
> they upgrade.
>
> In an ideal world, perhaps Apple would offer two iPhone sizes --
> like they do with products such as MacBook Pros, MacBook Airs, and
> iMacs. A smaller one with the classic 3.5-inch display, and a
> larger (say, 4.5-inch?) one for people who want that.
http://daringfireball.net/2012/09/iphone_5That holds up pretty well, but I undershot the two sizes by an inch apiece.
Also, I haven't said whether I think a 5.5-inch iPhone is actually any good, because, duh, I haven't even seen one yet, let alone used one.