i endured with my nexus one until last year (4yrs!) because no flag ship phone could be used with one hand.
i finally gave up for a moto x and i can barely press the top left corner without moving my hold.
I use my fingers to support my Nexus 5 and have no trouble reaching any of the corners.
I use my fingers to support my Nexus 5 and have no trouble reaching any of the corners.