Nokia Lumia 1520 is bigger than the iPhone 6 Plus and it doesn’t bend.
While it’s not as if any Windows Phone is a serious competitor in the so-called “phablet” space, I’ll bite. As far as the Nokia Lumia 1520, there have been problems with too much flex in the screen, screen sensitivity, tap & scroll issues, and battery drain issues related to overheating.
Which is more serious, the above or an admittedly rare problem with the chassis remaining bent when placed in the back pocket and sat upon as with the iPhone 6+?
An unbiased observer would say that Nokia has the bigger set of problems.