I've just checked the iphone 6 plus bend video.
If I were buying an iphone 6 it would not be the plus. Over time I think it is likely to bend if I put this into my front pocket.
This same guy made another bend test on the smaller iphone 6 (and a few other phones) -- the smaller iphone 6 seems to be OK. The moto X was the most resistant to bending.
(iphone 6 naming is dumb, they should have given the smaller model a unique name-- 'iphone 6 plus' is the big model, 'iphone 6' could be either)