On paper yes, but what about things that aren't on paper?
The 535 curbstomped the 635 on paper for the most part, but in reality, it doesn't have as solid as a feel and those touchscreen issues.
The 830 seems like a not-so-great deal, but what about build and not-so-prominent things like OIS?
A company doesn't just decide to make a great phone at a low price, there's a price somewhere... Even if its not the phone itself.