Siri and retina do not interest me. For me, important just my personal requirements for a smartphone.
In addition, think / hope / I sit / that I sit with WP 8.1 on a smartphone OS, that in the future much better harmonizes with my Win PC when the Android / iOS smartphones ...
Update 03/01/2015:
now runs the Lumia 625 also with the 2nd Win 8.1 update (denim)
It's scary to witness mood, how a BS always evolving.
The photo apps have been improved again, the home screen is even better individually configurable / available. The language assistant "Cortina" fulfilled now in his German "alpha version" already nearly the specifications of Siri and co. (Although me actually -after such forward not interested ;-)) and also the Winstore filled more and more with useful apps. Over the last 3 months I have also learned MS OneNote as cross-platform note software (also) on the 625 to know and love.
Small drawback: The side hardware buttons are extremely sensitive, so that the Lumia 625 is nothing in your pocket, because the middle button every day a full reset functions in your pocket at least 1x, which is accompanied at least by resetting the date. By 630, the problem was already solved but.
As much as I've gotten used to my new BS, I realize the fact that I now always regular press on iPad / iPod touch to the (nonexistent) "Back-button" ...